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d in (-oo:+oo)
6*d+2/3 = 200/3 // - 200/3
6*d+2/3-(200/3) = 0
6*d+2/3-200/3 = 0
6*d-66 = 0 // + 66
6*d = 66 // : 6
d = 66/6
d = 11
d = 11
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