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d in (-oo:+oo)
7*(-d-10) = -105 // + 105
7*(-d-10)+105 = 0
7*(-d-10)+105 = 0
35-7*d = 0
35-7*d = 0
35-7*d = 0 // - 35
-7*d = -35 // : -7
d = -35/(-7)
d = 5
d = 5
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