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x in (-oo:+oo)
x-((1/2)*y) = -6 // + 6
x-((1/2)*y)+6 = 0
x+(-1/2)*y+6 = 0
x-1/2*y+6 = 0 // - 6-1/2*y
x = -(6-1/2*y)
x = -(6-1/2*y)
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