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x in (-oo:+oo)
5*x = -1/8 // + -1/8
5*x-(-1/8) = 0
5*x+1/8 = 0
5*x+1/8 = 0 // - 1/8
5*x = -1/8 // : 5
x = -1/8/5
x = -1/40
x = -1/40
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