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d in (-oo:+oo)
-((1/7)*d)-1/2 = -93/154 // + -93/154
-((1/7)*d)-1/2-(-93/154) = 0
(-1/7)*d-1/2+93/154 = 0
8/77-1/7*d = 0 // - 8/77
-1/7*d = -8/77 // : -1/7
d = -8/77/(-1/7)
d = 8/11
d = 8/11
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