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2*x-(5/z) = y // - y
2*x-y-(5/z) = 0
2*x-y-5*z^-1 = 0
2*x-y-5*z^-1 = 0 // + -y-5*z^-1
2*x = -(-y-5*z^-1) // : 2
x = (-(-y-5*z^-1))/2
x = (y-(-5*z^-1))/2
x = (y-(-5*z^-1))/2
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