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x in (-oo:+oo)
6*x+3/7 = -11 // + 11
6*x+3/7+11 = 0
6*x+80/7 = 0 // - 80/7
6*x = -80/7 // : 6
x = -80/7/6
x = -40/21
x = -40/21
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