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