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(7/2)*x-2 = 28-(4*z) // - 28-(4*z)
(7/2)*x+4*z-28-2 = 0
7/2*x+4*z-30 = 0 // - 4*z-30
7/2*x = -(4*z-30) // : 7/2
x = (-(4*z-30))/7/2
x = 2/7*(30-(4*z))
x = 2/7*(30-(4*z))
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