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x in (-oo:+oo)
x/8 = -3/13 // + -3/13
x/8-(-3/13) = 0
x/8+3/13 = 0
1/8*x+3/13 = 0 // - 3/13
1/8*x = -3/13 // : 1/8
x = -3/13/1/8
x = -24/13
x = -24/13
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