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d in (-oo:+oo)
-4 = 5-2*d-(7*d) // - 5-2*d-(7*d)
7*d-(-2*d)-5-4 = 0
2*d+7*d-5-4 = 0
9*d-9 = 0 // + 9
9*d = 9 // : 9
d = 9/9
d = 1
d = 1
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