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d in (-oo:+oo)
11 = 5*d+2*d+4 // - 5*d+2*d+4
11-(5*d)-(2*d)-4 = 0
11-5*d-2*d-4 = 0
7-7*d = 0 // - 7
-7*d = -7 // : -7
d = -7/(-7)
d = 1
d = 1
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