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d in (-oo:+oo)
3*(4*d+3) = 57 // - 57
3*(4*d+3)-57 = 0
3*(4*d+3)-57 = 0
12*d-48 = 0
12*d-48 = 0
12*d-48 = 0 // + 48
12*d = 48 // : 12
d = 48/12
d = 4
d = 4
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