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x in (-oo:+oo)
x+x+2/3-(2/4) = 6 // - 6
x+x+2/3-(2/4)-6 = 0
x+x+2/3-1/2-6 = 0
2*x-35/6 = 0 // + 35/6
2*x = 35/6 // : 2
x = 35/6/2
x = 35/12
x = 35/12
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