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a in (-oo:+oo)
(a-4)/2-((5*(a-4))/8) = (5*a+20)/4 // - (5*a+20)/4
(a-4)/2-((5*(a-4))/8)-((5*a+20)/4) = 0
(a-4)/2+(-5/8)*(a-4)-((5*a+20)/4) = 0
(a-4)/2-5/8*(a-4)+(-1*(5*a+20))/4 = 0
(4*(a-4))/(2*4)+(-5/8*2*4*(a-4))/(2*4)+(-1*2*(5*a+20))/(2*4) = 0
4*(a-4)-5/8*2*4*(a-4)-1*2*(5*a+20) = 0
4-a-10*a-40 = 0
-11*a-36 = 0
(-11*a-36)/(2*4) = 0
(-11*a-36)/(2*4) = 0 // * 2*4
-11*a-36 = 0
-11*a-36 = 0 // + 36
-11*a = 36 // : -11
a = 36/(-11)
a = -36/11
a = -36/11
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