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x in (-oo:+oo)
(1/2)*x-y = 9 // - 9
(1/2)*x-y-9 = 0
1/2*x-y-9 = 0 // + -y-9
1/2*x = -(-y-9) // : 1/2
x = (-(-y-9))/1/2
x = 2*(y+9)
x = 2*(y+9)
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