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a in (-oo:+oo)
4*(a+8) = (1/2)*(4*a-8) // - (1/2)*(4*a-8)
4*(a+8)-((1/2)*(4*a-8)) = 0
4*(a+8)+(-1/2)*(4*a-8) = 0
4*(a+8)-1/2*(4*a-8) = 0
4*(a+8)-1/2*(4*a-8) = 0
2*a+36 = 0
2*a+36 = 0
2*a+36 = 0 // - 36
2*a = -36 // : 2
a = -36/2
a = -18
a = -18
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