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X in (-oo:+oo)
(2*X)/5 = -7/8 // + -7/8
(2*X)/5-(-7/8) = 0
(2*X)/5+7/8 = 0
2/5*X+7/8 = 0 // - 7/8
2/5*X = -7/8 // : 2/5
X = -7/8/2/5
X = -35/16
X = -35/16
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