Align equations with the same spacing

Question

I can't manage to get the "=" proper spacing. I would like to get LHS = RHS, instead of LHS  = RHS
Code used:
documentclass[a4paper,12pt]{report}
usepackage{geometry}
usepackage{amsmath,amssymb}

begin{document}

begin{align*}
    begin{cases}
        W &= F , Delta x
        W &= E_c
        F &= m a
        x &= x_0 + v_0 t + frac{1}{2}a t^2
        v &= v_0 + a t
    end{cases}
    end{align*}

end{document}

SerMarFe · Answer

Thank you, this worked for me:
usepackage{amsmath,mathtools}

makeatletter
% a copy of dcases but without quad in the second argument
% and with {} at the start of the second column so &= gets relation space like align
newcases{dcasesnoquad}{}{%
  $m@thdisplaystyle{##}$hfil}{$m@thdisplaystyle{{}##}$hfil}{lbrace}{.}
makeatother

Mico · Answer

I would like to suggest that you make three changes. First, encase the five equations in an aligned environment. Second, since you're not really making use of the machinery of the cases environment, replace the cases environment with left{ ... right.. Third, since you're not making use of the align* machinery either, I'd replace the align* environment with [ ... ].

documentclass[a4paper,12pt]{report}
usepackage{geometry}
usepackage{amsmath,amssymb}

begin{document}
    [
    left{
    begin{aligned}
        W &= F , Delta x
        W &= E_c
        F &= m a
        x &= x_0 + v_0 t + tfrac{1}{2}a t^2
        v &= v_0 + a t
    end{aligned}
    right.
    ]
end{document}

Align equations with the same spacing

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