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z in (-oo:+oo)
(z+6)/3 = (2*z)/4 // - (2*z)/4
(z+6)/3-((2*z)/4) = 0
(z+6)/3+(-1/2)*z = 0
(z+6)/3-z/2 = 0
(2*(z+6))/(2*3)+(3*(-z))/(2*3) = 0
2*(z+6)+3*(-z) = 0
12-z = 0
(12-z)/(2*3) = 0
(12-z)/(2*3) = 0 // * 2*3
12-z = 0
12-z = 0 // - 12
-z = -12 // * -1
z = 12
z = 12
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