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d in (-oo:+oo)
3-6*d = 5*d-30 // - 5*d-30
3-6*d-(5*d)+30 = 0
3-6*d-5*d+30 = 0
33-11*d = 0 // - 33
-11*d = -33 // : -11
d = -33/(-11)
d = 3
d = 3
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