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d in (-oo:+oo)
(-6/7)*d+8 = 38/7 // - 38/7
(-6/7)*d-(38/7)+8 = 0
(-6/7)*d-38/7+8 = 0
18/7-6/7*d = 0 // - 18/7
-6/7*d = -18/7 // : -6/7
d = -18/7/(-6/7)
d = 3
d = 3
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