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d in (-oo:+oo)
5*d-((3*d)/5)-7 = -7 // + 7
5*d-((3*d)/5)-7+7 = 0
5*d+(-3/5)*d-7+7 = 0
22/5*d = 0 // : 22/5
d = 0
d = 0
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