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7*x-(4*z) = (9/2)*y // - (9/2)*y
7*x-((9/2)*y)-(4*z) = 0
7*x+(-9/2)*y-4*z = 0
7*x-9/2*y-4*z = 0 // + -9/2*y-4*z
7*x = -(-9/2*y-4*z) // : 7
x = (-(-9/2*y-4*z))/7
x = (-(-9/2*y-4*z))/7
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