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z in (-oo:+oo)
5/6 = (z-7)/18 // - (z-7)/18
5/6-((z-7)/18) = 0
(-1*(z-7))/18+5/6 = 0
(-1*6*(z-7))/(6*18)+(5*18)/(6*18) = 0
5*18-1*6*(z-7) = 0
132-6*z = 0
(132-6*z)/(6*18) = 0
(132-6*z)/(6*18) = 0 // * 6*18
132-6*z = 0
132-6*z = 0 // - 132
-6*z = -132 // : -6
z = -132/(-6)
z = 22
z = 22
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