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d in (-oo:+oo)
-75 = 5-6*d-(2*d) // - 5-6*d-(2*d)
2*d-(-6*d)-75-5 = 0
6*d+2*d-75-5 = 0
8*d-80 = 0 // + 80
8*d = 80 // : 8
d = 80/8
d = 10
d = 10
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