line breaking in mbox environment

Question

I'm writing a combinatorics resume for me so I need to write things like some number is equal to the number of objects satisfying some condition. In the way of this I tried
documentclass{article}
usepackage[utf8]{inputenc}
usepackage[spanish]{babel}
usepackage{enumerate}
usepackage[shortlabels]{enumitem}
usepackage{amsthm}
usepackage{xcolor}
usepackage{makeidx} 
usepackage{mathtools} 
usepackage{amssymb} 
usepackage[most]{tcolorbox}

newcommand{row}{operatorname{row}}
newcommand{col}{operatorname{col}}

begin{document}
    [M_{lambda alpha}=#mbox{matrices such that  row(A)=lambda, col(A)=alpha}]
end{document}

but` is not giving the break line I need. Probably I'm not using the right environment?
Basically what I want is an equality of two things but in the right-hand side I need two lines (or more...)
p.s: obviously I defined row and col in the preamble...

Zarko · Accepted Answer

See, if the following is what you looking for:
documentclass{article}
%usepackage[utf8]{inputenc} % is default for recent article
usepackage[spanish]{babel}
usepackage{mathtools}

newcommand{row}{operatorname{row}}
newcommand{col}{operatorname{col}}
% other packages in your preamble are not relevant for your example

begin{document}
begin{align*}
M_{lambda alpha} & = text{# matrices such that} 
                   &qquad   row(A)=lambda, col(A)=alpha
end{align*}
end{document}

Addendum:
documentclass{article}
usepackage[spanish]{babel}
usepackage{mathtools}

newcommand{row}{operatorname{row}}
newcommand{col}{operatorname{col}}

begin{document}
[
M_{lambda alpha} = 
    begin{aligned}
    & text{# matrices such that} 
    & row(A)=lambda, col(A)=alpha
    end{aligned}
]
or
[
M_{lambda alpha} = #
    begin{aligned}
    & text{matrices such that} 
    & row(A)=lambda, col(A)=alpha
    end{aligned}
]
end{document}

line breaking in mbox environment

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