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