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X in (-oo:+oo)
3*X-(8/4) = 4 // - 4
3*X-(8/4)-4 = 0
3*X-4-2 = 0
3*X-6 = 0 // + 6
3*X = 6 // : 3
X = 6/3
X = 2
X = 2
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