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z in (-oo:+oo)
(2*z+7)/3 = (z-1)/4 // - (z-1)/4
(2*z+7)/3-((z-1)/4) = 0
(2*z+7)/3+(-1*(z-1))/4 = 0
(4*(2*z+7))/(3*4)+(-1*3*(z-1))/(3*4) = 0
4*(2*z+7)-1*3*(z-1) = 0
5*z+31 = 0
(5*z+31)/(3*4) = 0
(5*z+31)/(3*4) = 0 // * 3*4
5*z+31 = 0
5*z+31 = 0 // - 31
5*z = -31 // : 5
z = -31/5
z = -31/5
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