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x in (-oo:+oo)
x/5+1/8 = -7/8 // + -7/8
x/5+1/8-(-7/8) = 0
x/5+1/8+7/8 = 0
1/5*x+1 = 0 // - 1
1/5*x = -1 // : 1/5
x = -1/1/5
x = -5
x = -5
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