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d in (-oo:+oo)
5*d+4 = 6*d+8 // - 6*d+8
5*d-(6*d)-8+4 = 0
5*d-6*d-8+4 = 0
-d-4 = 0 // + 4
-d = 4 // * -1
d = -4
d = -4
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