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d in (-oo:+oo)
1-6*d-(7*d) = 79 // - 79
1-6*d-(7*d)-79 = 0
1-6*d-7*d-79 = 0
-13*d-78 = 0 // + 78
-13*d = 78 // : -13
d = 78/(-13)
d = -6
d = -6
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