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d in (-oo:+oo)
-65 = -5*d-(2*d)-2 // + -5*d-(2*d)-2
2*d-(-5*d)-65+2 = 0
5*d+2*d-65+2 = 0
7*d-63 = 0 // + 63
7*d = 63 // : 7
d = 63/7
d = 9
d = 9
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