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d in (-oo:+oo)
3*d-1/5 = -7/5 // + -7/5
3*d-1/5-(-7/5) = 0
3*d-1/5+7/5 = 0
3*d+6/5 = 0 // - 6/5
3*d = -6/5 // : 3
d = -6/5/3
d = -2/5
d = -2/5
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