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(1/7)*x+4*z = x-z+5 // - x-z+5
(1/7)*x-x+4*z+z-5 = 0
5*z-6/7*x-5 = 0 // - 5*z-5
-6/7*x = -(5*z-5) // : -6/7
x = (-(5*z-5))/(-6/7)
x = -7/6*(5-(5*z))
x = -7/6*(5-(5*z))
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