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a in (-oo:+oo)
(a+2)/2-((a-4)/4) = 0
(a+2)/2+(-1*(a-4))/4 = 0
(4*(a+2))/(2*4)+(-1*2*(a-4))/(2*4) = 0
4*(a+2)-1*2*(a-4) = 0
2*a+16 = 0
(2*a+16)/(2*4) = 0
(2*a+16)/(2*4) = 0 // * 2*4
2*a+16 = 0
2*a+16 = 0 // - 16
2*a = -16 // : 2
a = -16/2
a = -8
a = -8
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