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d in (-oo:+oo)
(8/7)*d+3 = 1 // - 1
(8/7)*d-1+3 = 0
8/7*d+2 = 0 // - 2
8/7*d = -2 // : 8/7
d = -2/8/7
d = -7/4
d = -7/4
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