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d in (-oo:+oo)
7*d+1/5 = -244/5 // + -244/5
7*d+1/5-(-244/5) = 0
7*d+1/5+244/5 = 0
7*d+49 = 0 // - 49
7*d = -49 // : 7
d = -49/7
d = -7
d = -7
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