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d in (-oo:+oo)
5*d-(6*d)+3 = 11 // - 11
5*d-(6*d)-11+3 = 0
5*d-6*d-11+3 = 0
-d-8 = 0 // + 8
-d = 8 // * -1
d = -8
d = -8
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