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x in (-oo:+oo)
2*x-(4/2) = 4-x // - 4-x
2*x+x-(4/2)-4 = 0
2*x+x-4-2 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x = 2
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