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d in (-oo:+oo)
4 = (3*d)/9 // - (3*d)/9
4-((3*d)/9) = 0
(-1/3)*d+4 = 0
4-1/3*d = 0 // - 4
-1/3*d = -4 // : -1/3
d = -4/(-1/3)
d = 12
d = 12
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