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d in (-oo:+oo)
(-2/3)*d+2/3 = -10/3 // + -10/3
(-2/3)*d+2/3-(-10/3) = 0
(-2/3)*d+2/3+10/3 = 0
4-2/3*d = 0 // - 4
-2/3*d = -4 // : -2/3
d = -4/(-2/3)
d = 6
d = 6
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