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