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