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x in (-oo:+oo)
((2/5)*x^1)/5 = -7/5 // + -7/5
((2/5)*x^1)/5-(-7/5) = 0
((2/5)*x)/5+7/5 = 0
2/25*x+7/5 = 0 // - 7/5
2/25*x = -7/5 // : 2/25
x = -7/5/2/25
x = -35/2
x = -35/2
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