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d in (-oo:+oo)
5-2*d = 6*d-43 // - 6*d-43
5-2*d-(6*d)+43 = 0
5-2*d-6*d+43 = 0
48-8*d = 0 // - 48
-8*d = -48 // : -8
d = -48/(-8)
d = 6
d = 6
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