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z in (-oo:+oo)
(-1/5)*(z+12) = (2/5)*(9-(3*z)) // - (2/5)*(9-(3*z))
(-1/5)*(z+12)-((2/5)*(9-(3*z))) = 0
(-1/5)*(z+12)+(-2/5)*(9-3*z) = 0
-1/5*(z+12)-2/5*(9-3*z) = 0
-1/5*(z+12)-2/5*(9-3*z) = 0
z-6 = 0
z-6 = 0
z-6 = 0 // + 6
z = 6
z = 6
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