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d in (-oo:+oo)
6*(-(7*d)-5) = -198 // + 198
6*(-(7*d)-5)+198 = 0
6*(-7*d-5)+198 = 0
6*(-7*d-5)+198 = 0
168-42*d = 0
168-42*d = 0
168-42*d = 0 // - 168
-42*d = -168 // : -42
d = -168/(-42)
d = 4
d = 4
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