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x in (-oo:+oo)
7*x+7/8 = -371/88 // + -371/88
7*x+7/8-(-371/88) = 0
7*x+7/8+371/88 = 0
7*x+56/11 = 0 // - 56/11
7*x = -56/11 // : 7
x = -56/11/7
x = -8/11
x = -8/11
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