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d in (-oo:+oo)
2-6*d-(3*d) = 74 // - 74
2-6*d-(3*d)-74 = 0
2-6*d-3*d-74 = 0
-9*d-72 = 0 // + 72
-9*d = 72 // : -9
d = 72/(-9)
d = -8
d = -8
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