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a in (-oo:+oo)
a-((5*(a-1))/4)-(4/5) = 4*a+4/2 // - 4*a+4/2
a-((5*(a-1))/4)-(4*a)-(4/5)-(4/2) = 0
(-5/4)*(a-1)+a-4*a-4/5-2 = 0
a-5/4*(a-1)-4*a-4/5-2 = 0
(-5/4*5*(a-1))/5+(5*a)/5+(-4*5*a)/5-4/5+(-2*5)/5 = 0
5*a-5/4*5*(a-1)-4*5*a-2*5-4 = 0
25/4-5/4*a-20*a-10-4 = 0
25/4-85/4*a-10-4 = 0
9/4-85/4*a-10 = 0
-85/4*a-31/4 = 0
(-85/4*a-31/4)/5 = 0
(-85/4*a-31/4)/5 = 0 // * 5
-85/4*a-31/4 = 0
-85/4*a-31/4 = 0 // + 31/4
-85/4*a = 31/4 // : -85/4
a = 31/4/(-85/4)
a = -31/85
a = -31/85
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