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