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x in (-oo:+oo)
(1/2)*y = 4-x // - 4-x
x+(1/2)*y-4 = 0
x+1/2*y-4 = 0 // - 1/2*y-4
x = -(1/2*y-4)
x = 4-(1/2*y)
x = 4-(1/2*y)
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