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z in (-oo:+oo)
(1/6)*(12*z-42) = (-3/4)*(4-(6*z)) // - (-3/4)*(4-(6*z))
(1/6)*(12*z-42)-((-3/4)*(4-(6*z))) = 0
(1/6)*(12*z-42)+(3/4)*(4-6*z) = 0
1/6*(12*z-42)+3/4*(4-6*z) = 0
1/6*(12*z-42)+3/4*(4-6*z) = 0
-5/2*z-4 = 0
-5/2*z-4 = 0
-5/2*z-4 = 0 // + 4
-5/2*z = 4 // : -5/2
z = 4/(-5/2)
z = -8/5
z = -8/5
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