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