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d in (-oo:+oo)
3*(7*d+8) = 276 // - 276
3*(7*d+8)-276 = 0
3*(7*d+8)-276 = 0
21*d-252 = 0
21*d-252 = 0
21*d-252 = 0 // + 252
21*d = 252 // : 21
d = 252/21
d = 12
d = 12
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