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(x+5)/z = y // - y
(x+5)/z-y = 0
(x+5)/z+(-y*z)/z = 0
x-y*z+5 = 0
x-(y*z)+5 = 0
(x-(y*z)+5)/z = 0
(x-(y*z)+5)/z = 0 // * z
x-(y*z)+5 = 0
x-(y*z)+5 = 0 // - 5-(y*z)
x = -(5-(y*z))
x = y*z-5
x = y*z-5
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