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(31/6)*x-((1/6)*x)+7*z-z = 0
(31/6)*x+(-1/6)*x+7*z-z = 0
5*x+6*z = 0 // - 6*z
5*x = -(6*z) // : 5
x = (-(6*z))/5
x = (-6*z)/5
x = (-6*z)/5
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