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d in (-oo:+oo)
(-2/3)*d = -2/7 // + -2/7
(-2/3)*d-(-2/7) = 0
(-2/3)*d+2/7 = 0
2/7-2/3*d = 0 // - 2/7
-2/3*d = -2/7 // : -2/3
d = -2/7/(-2/3)
d = 3/7
d = 3/7
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