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4*x-(5/y) = 2*z // - 2*z
4*x-(5/y)-(2*z) = 0
4*x-5*y^-1-2*z = 0
4*x-5*y^-1-2*z = 0 // + -5*y^-1-2*z
4*x = -(-5*y^-1-2*z) // : 4
x = (-(-5*y^-1-2*z))/4
x = (-(-5*y^-1-2*z))/4
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