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d in (-oo:+oo)
3*(2*d+3) = 63 // - 63
3*(2*d+3)-63 = 0
3*(2*d+3)-63 = 0
6*d-54 = 0
6*d-54 = 0
6*d-54 = 0 // + 54
6*d = 54 // : 6
d = 54/6
d = 9
d = 9
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