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d in (-oo:+oo)
37 = 3*d+2*d+7 // - 3*d+2*d+7
37-(3*d)-(2*d)-7 = 0
37-3*d-2*d-7 = 0
30-5*d = 0 // - 30
-5*d = -30 // : -5
d = -30/(-5)
d = 6
d = 6
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