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x in (-oo:+oo)
x-3 = (1/2)*y // - (1/2)*y
x-((1/2)*y)-3 = 0
x+(-1/2)*y-3 = 0
x-1/2*y-3 = 0 // + -1/2*y-3
x = -(-1/2*y-3)
x = 3-(-1/2*y)
x = 3-(-1/2*y)
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