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d in (-oo:+oo)
8-4*d = 7*d-25 // - 7*d-25
8-4*d-(7*d)+25 = 0
8-4*d-7*d+25 = 0
33-11*d = 0 // - 33
-11*d = -33 // : -11
d = -33/(-11)
d = 3
d = 3
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