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d in (-oo:+oo)
7*d+5/6 = -197/66 // + -197/66
7*d+5/6-(-197/66) = 0
7*d+5/6+197/66 = 0
7*d+42/11 = 0 // - 42/11
7*d = -42/11 // : 7
d = -42/11/7
d = -6/11
d = -6/11
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