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x in (-oo:+oo)
(1/2)*y-7 = x // - x
(1/2)*y-x-7 = 0
1/2*y-x-7 = 0 // - 1/2*y-7
-x = -(1/2*y-7) // * -1
x = 1/2*y-7
x = 1/2*y-7
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