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d in (-oo:+oo)
-5*d-7 = 2*d+70 // - 2*d+70
-5*d-(2*d)-70-7 = 0
-5*d-2*d-70-7 = 0
-7*d-77 = 0 // + 77
-7*d = 77 // : -7
d = 77/(-7)
d = -11
d = -11
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