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d in (-oo:+oo)
5*d+9 = 3*d+11 // - 3*d+11
5*d-(3*d)-11+9 = 0
5*d-3*d-11+9 = 0
2*d-2 = 0 // + 2
2*d = 2 // : 2
d = 2/2
d = 1
d = 1
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