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x in (-oo:+oo)
x+2*x-(4/2) = 2*x+4 // - 2*x+4
x+2*x-(2*x)-(4/2)-4 = 0
x+2*x-2*x-4-2 = 0
x-6 = 0 // + 6
x = 6
x = 6
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