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d in (-oo:+oo)
6*d+3 = 135-6*d // - 135-6*d
6*d-(-6*d)-135+3 = 0
6*d+6*d-135+3 = 0
12*d-132 = 0 // + 132
12*d = 132 // : 12
d = 132/12
d = 11
d = 11
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