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d in (-oo:+oo)
2*d-5 = 7*d-45 // - 7*d-45
2*d-(7*d)-5+45 = 0
2*d-7*d-5+45 = 0
40-5*d = 0 // - 40
-5*d = -40 // : -5
d = -40/(-5)
d = 8
d = 8
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