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d in (-oo:+oo)
(3/7)*d+(1/6)*d+3/7 = -22/7 // + -22/7
(3/7)*d+(1/6)*d+3/7-(-22/7) = 0
(3/7)*d+(1/6)*d+3/7+22/7 = 0
25/42*d+25/7 = 0 // - 25/7
25/42*d = -25/7 // : 25/42
d = -25/7/25/42
d = -6
d = -6
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