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a in (-oo:+oo)
a-((5*(a-4))/10)-(1/4) = 5*a+15/5 // - 5*a+15/5
a-((5*(a-4))/10)-(5*a)-(1/4)-(15/5) = 0
(-1/2)*(a-4)+a-5*a-1/4-3 = 0
a-1/2*(a-4)-5*a-1/4-3 = 0
(-1/2*4*(a-4))/4+(4*a)/4+(-5*4*a)/4-1/4+(-3*4)/4 = 0
4*a-1/2*4*(a-4)-5*4*a-3*4-1 = 0
2*a-20*a-12-1+8 = 0
8-18*a-12-1 = 0
7-18*a-12 = 0
-18*a-5 = 0
(-18*a-5)/4 = 0
(-18*a-5)/4 = 0 // * 4
-18*a-5 = 0
-18*a-5 = 0 // + 5
-18*a = 5 // : -18
a = 5/(-18)
a = -5/18
a = -5/18
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