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x in (-oo:+oo)
x+x-(2/3)+3/4 = 11/6 // - 11/6
x+x-(2/3)+3/4-(11/6) = 0
x+x-2/3+3/4-11/6 = 0
2*x-7/4 = 0 // + 7/4
2*x = 7/4 // : 2
x = 7/4/2
x = 7/8
x = 7/8
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