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d in (-oo:+oo)
9-5*d-(2*d) = -33 // + 33
9-5*d-(2*d)+33 = 0
9-5*d-2*d+33 = 0
42-7*d = 0 // - 42
-7*d = -42 // : -7
d = -42/(-7)
d = 6
d = 6
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