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x in (-oo:+oo)
(2*x)/5 = -1/8 // + -1/8
(2*x)/5-(-1/8) = 0
(2*x)/5+1/8 = 0
2/5*x+1/8 = 0 // - 1/8
2/5*x = -1/8 // : 2/5
x = -1/8/2/5
x = -5/16
x = -5/16
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