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d in (-oo:+oo)
3*d+10 = 64-6*d // - 64-6*d
3*d-(-6*d)-64+10 = 0
3*d+6*d-64+10 = 0
9*d-54 = 0 // + 54
9*d = 54 // : 9
d = 54/9
d = 6
d = 6
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