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z in (-oo:+oo)
3*(2*z+5) = (3*z)/4+36 // - (3*z)/4+36
3*(2*z+5)-((3*z)/4)-36 = 0
3*(2*z+5)+(-3/4)*z-36 = 0
3*(2*z+5)+(-3*z)/4-36 = 0
(3*4*(2*z+5))/4+(-3*z)/4+(-36*4)/4 = 0
3*4*(2*z+5)-3*z-36*4 = 0
21*z-144+60 = 0
21*z-84 = 0
(21*z-84)/4 = 0
(21*z-84)/4 = 0 // * 4
21*z-84 = 0
21*z-84 = 0 // + 84
21*z = 84 // : 21
z = 84/21
z = 4
z = 4
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