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z in (-oo:+oo)
10*(z-4) = (12*z)/2 // - (12*z)/2
10*(z-4)-((12*z)/2) = 0
10*(z-4)-6*z = 0
10*(z-4)-6*z = 0
4*z-40 = 0
4*z-40 = 0
4*z-40 = 0 // + 40
4*z = 40 // : 4
z = 40/4
z = 10
z = 10
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