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d in (-oo:+oo)
(-2/3)*d-(1/3) = (5/6)*d+41/66 // - (5/6)*d+41/66
(-2/3)*d-((5/6)*d)-(1/3)-(41/66) = 0
(-2/3)*d+(-5/6)*d-1/3-41/66 = 0
-3/2*d-21/22 = 0 // + 21/22
-3/2*d = 21/22 // : -3/2
d = 21/22/(-3/2)
d = -7/11
d = -7/11
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