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d in (-oo:+oo)
7*(8-(6*d)) = -112 // + 112
7*(8-(6*d))+112 = 0
7*(8-6*d)+112 = 0
7*(8-6*d)+112 = 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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