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d in (-oo:+oo)
-54 = 3*d+2*d+6 // - 3*d+2*d+6
-(3*d)-(2*d)-54-6 = 0
-3*d-2*d-54-6 = 0
-5*d-60 = 0 // + 60
-5*d = 60 // : -5
d = 60/(-5)
d = -12
d = -12
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