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4*x-(5/7) = 2*z // - 2*z
4*x-(2*z)-(5/7) = 0
4*x-2*z-5/7 = 0
4*x-2*z-5/7 = 0 // + -2*z-5/7
4*x = -(-2*z-5/7) // : 4
x = (-(-2*z-5/7))/4
x = (5/7-(-2*z))/4
x = (5/7-(-2*z))/4
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