How to make a division line a bit longer than normal?

Question

documentclass[preview,border=12pt,12pt]{standalone}

usepackage{mathtools}

begin{document}
$
displaystyle
begin{aligned}
-frac{3x}{10} &= 6 
-frac{3}{10}x &= 6
        x       &= frac{6}{-tfrac{3}{10}}
                &= -frac{tfrac{6}{1}}{tfrac{3}{10}}
                &= - frac{6}{1}times frac{10}{3} 
                &= -20
end{aligned}
$
end{document}

Result

Expected

egreg · Accepted Answer

I don't think it's useful: the fraction line on the formula axis (midway of the = sign) is sufficient to tell the reader what's the main one.
Using ; is perhaps exaggerated, try with ,.
documentclass{article}
usepackage{mathtools}

newcommand{Mfrac}[2]{% main fraction
  frac{;#1;}{;#2;}%
}

begin{document}

[
begin{aligned}
-frac{3x}{10} &= 6 
-frac{3}{10}x &= 6
             x &= Mfrac{6}{-tfrac{3}{10}}
               &= -Mfrac{tfrac{6}{1}}{tfrac{3}{10}}
               &= - Mfrac{6}{1}times Mfrac{10}{3}  % <-- is it good here?
               &= -20
end{aligned}
]
end{document}

Jinwen · Answer

Perhaps you can manually add some white space by, say, ~, , or even hspace?
[
    begin{aligned}
        -frac{3x}{10} &= 6 
        -frac{3}{10}x &= 6
                x       &= frac{6}{-tfrac{3}{10}}
                        &= -frac{~tfrac{6}{1}~}{tfrac{3}{10}}
                        &= - frac{~6~}{1}times frac{10}{3} 
                        &= -20
    end{aligned}
]

How to make a division line a bit longer than normal?

Result

Expected

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