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9*z = (3*x)/y // - (3*x)/y
9*z-((3*x)/y) = 0
9*z-3*x*y^-1 = 0
9*z-3*x*y^-1 = 0 // - 9*z
-3*x*y^-1 = -(9*z) // : -3*y^-1
x = (-(9*z))/(-3*y^-1)
x = 3*y*z
x = 3*y*z
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