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x in (-oo:+oo)
3*x-(6/7) = -2 // + 2
3*x-(6/7)+2 = 0
3*x-6/7+2 = 0
3*x+8/7 = 0 // - 8/7
3*x = -8/7 // : 3
x = -8/7/3
x = -8/21
x = -8/21
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