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x in (-oo:+oo)
(5*z)/16 = x/2 // - x/2
(5*z)/16-(x/2) = 0
5/16*z-1/2*x = 0 // - 5/16*z
-1/2*x = -(5/16*z) // : -1/2
x = (-(5/16*z))/(-1/2)
x = 5/8*z
x = 5/8*z
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