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