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