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d in (-oo:+oo)
6*d-(3*d)+3 = 36 // - 36
6*d-(3*d)-36+3 = 0
6*d-3*d-36+3 = 0
3*d-33 = 0 // + 33
3*d = 33 // : 3
d = 33/3
d = 11
d = 11
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