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z in (-oo:+oo)
(1/3)*(42-(18*z)) = 2*(8-(4*z)) // - 2*(8-(4*z))
(1/3)*(42-(18*z))-(2*(8-(4*z))) = 0
(1/3)*(42-18*z)-2*(8-4*z) = 0
1/3*(42-18*z)-2*(8-4*z) = 0
1/3*(42-18*z)-2*(8-4*z) = 0
2*z-2 = 0
2*z-2 = 0
2*z-2 = 0 // + 2
2*z = 2 // : 2
z = 2/2
z = 1
z = 1
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