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x in (-oo:+oo)
6*x-(6/7) = -132/7 // + -132/7
6*x-(6/7)-(-132/7) = 0
6*x-6/7+132/7 = 0
6*x+18 = 0 // - 18
6*x = -18 // : 6
x = -18/6
x = -3
x = -3
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