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d in (-oo:+oo)
(-1/3)*d+7 = 29/3 // - 29/3
(-1/3)*d-(29/3)+7 = 0
(-1/3)*d-29/3+7 = 0
-1/3*d-8/3 = 0 // + 8/3
-1/3*d = 8/3 // : -1/3
d = 8/3/(-1/3)
d = -8
d = -8
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