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a in (-oo:+oo)
a-((5*(a-3))/10)-(4/4) = 3*a+12/5 // - 3*a+12/5
a-((5*(a-3))/10)-(3*a)-(4/4)-(12/5) = 0
(-1/2)*(a-3)+a-3*a-12/5-1 = 0
a-1/2*(a-3)-3*a-12/5-1 = 0
(-1/2*5*(a-3))/5+(5*a)/5+(-3*5*a)/5-12/5+(-1*5)/5 = 0
5*a-1/2*5*(a-3)-3*5*a-1*5-12 = 0
5/2*a-15*a-12-5+15/2 = 0
15/2-25/2*a-12-5 = 0
-25/2*a-5-9/2 = 0
-25/2*a-19/2 = 0
(-25/2*a-19/2)/5 = 0
(-25/2*a-19/2)/5 = 0 // * 5
-25/2*a-19/2 = 0
-25/2*a-19/2 = 0 // + 19/2
-25/2*a = 19/2 // : -25/2
a = 19/2/(-25/2)
a = -19/25
a = -19/25
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