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d in (-oo:+oo)
(-4/7)*d-4 = -64/7 // + -64/7
(-4/7)*d-(-64/7)-4 = 0
(-4/7)*d+64/7-4 = 0
36/7-4/7*d = 0 // - 36/7
-4/7*d = -36/7 // : -4/7
d = -36/7/(-4/7)
d = 9
d = 9
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