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