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d in (-oo:+oo)
-37 = 7*d-(2*d)+8 // - 7*d-(2*d)+8
2*d-(7*d)-37-8 = 0
2*d-7*d-37-8 = 0
-5*d-45 = 0 // + 45
-5*d = 45 // : -5
d = 45/(-5)
d = -9
d = -9
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