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(1/4)*(12*x-16)-((1/12)*(72*x-(2*z))) = 0
(1/4)*(12*x-16)+(-1/12)*(72*x-2*z) = 0
1/4*(12*x-16)-1/12*(72*x-2*z) = 0
1/4*(12*x-16)-1/12*(72*x-2*z) = 0
1/6*z-3*x-4 = 0
1/6*z-3*x-4 = 0
1/6*z-3*x-4 = 0 // - 1/6*z-4
-3*x = -(1/6*z-4) // : -3
x = (-(1/6*z-4))/(-3)
x = (4-(1/6*z))/(-3)
x = (4-(1/6*z))/(-3)
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