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d in (-oo:+oo)
-5*d-8 = -(7*d)-28 // + -(7*d)-28
7*d-5*d-8+28 = 0
2*d+20 = 0 // - 20
2*d = -20 // : 2
d = -20/2
d = -10
d = -10
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