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X in (-oo:+oo)
X+X-(2/3)-(4/4) = 10 // - 10
X+X-(2/3)-(4/4)-10 = 0
X+X-2/3-10-1 = 0
2*X-35/3 = 0 // + 35/3
2*X = 35/3 // : 2
X = 35/3/2
X = 35/6
X = 35/6
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