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d in (-oo:+oo)
9 = 5*d+2*d-5 // - 5*d+2*d-5
5-(5*d)-(2*d)+9 = 0
5-5*d-2*d+9 = 0
14-7*d = 0 // - 14
-7*d = -14 // : -7
d = -14/(-7)
d = 2
d = 2
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