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d in (-oo:+oo)
3*(2*d+7) = -51 // + 51
3*(2*d+7)+51 = 0
3*(2*d+7)+51 = 0
6*d+72 = 0
6*d+72 = 0
6*d+72 = 0 // - 72
6*d = -72 // : 6
d = -72/6
d = -12
d = -12
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