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