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x in (-oo:+oo)
x/8 = -3/7 // + -3/7
x/8-(-3/7) = 0
x/8+3/7 = 0
1/8*x+3/7 = 0 // - 3/7
1/8*x = -3/7 // : 1/8
x = -3/7/1/8
x = -24/7
x = -24/7
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