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x in (-oo:+oo)
(3*x+y)/z = 2 // - 2
(3*x+y)/z-2 = 0
(3*x+y)/z+(-2*z)/z = 0
3*x+y-2*z = 0
(3*x+y-2*z)/z = 0
(3*x+y-2*z)/z = 0 // * z
3*x+y-2*z = 0
3*x+y-2*z = 0 // - y-2*z
3*x = -(y-2*z) // : 3
x = (-(y-2*z))/3
x = (-(y-2*z))/3
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