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d in (-oo:+oo)
7-3*d-(5*d) = -41 // + 41
7-3*d-(5*d)+41 = 0
7-3*d-5*d+41 = 0
48-8*d = 0 // - 48
-8*d = -48 // : -8
d = -48/(-8)
d = 6
d = 6
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