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d in (-oo:+oo)
3*(4*d+1) = -9 // + 9
3*(4*d+1)+9 = 0
3*(4*d+1)+9 = 0
12*d+12 = 0
12*d+12 = 0
12*d+12 = 0 // - 12
12*d = -12 // : 12
d = -12/12
d = -1
d = -1
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