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d in (-oo:+oo)
3*d+7/10 = -23/10 // + -23/10
3*d+7/10-(-23/10) = 0
3*d+7/10+23/10 = 0
3*d+3 = 0 // - 3
3*d = -3 // : 3
d = -3/3
d = -1
d = -1
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