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d in (-oo:+oo)
(-3/7)*d+3 = 75/28 // - 75/28
(-3/7)*d-(75/28)+3 = 0
(-3/7)*d-75/28+3 = 0
9/28-3/7*d = 0 // - 9/28
-3/7*d = -9/28 // : -3/7
d = -9/28/(-3/7)
d = 3/4
d = 3/4
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