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z in (-oo:+oo)
7*((1-(2*z))/3)+5*z = -2 // + 2
7*((1-(2*z))/3)+5*z+2 = 0
7*((1-2*z)/3)+5*z+2 = 0
(7*(1-2*z))/3+5*z+2 = 0
(7*(1-2*z))/3+(3*5*z)/3+(2*3)/3 = 0
7*(1-2*z)+3*5*z+2*3 = 0
z+6+7 = 0
z+13 = 0
(z+13)/3 = 0
(z+13)/3 = 0 // * 3
z+13 = 0
z+13 = 0 // - 13
z = -13
z = -13
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