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d in (-oo:+oo)
5 = -d/7 // + -d/7
5-(-d/7) = 0
(1/7)*d+5 = 0
1/7*d+5 = 0 // - 5
1/7*d = -5 // : 1/7
d = -5/1/7
d = -35
d = -35
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