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x in (-oo:+oo)
x/2-z = 3 // - 3
x/2-z-3 = 0
1/2*x-z-3 = 0 // + -z-3
1/2*x = -(-z-3) // : 1/2
x = (-(-z-3))/1/2
x = 2*(z+3)
x = 2*(z+3)
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