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d in (-oo:+oo)
-299/10 = 5*d+5*d+1/10 // - 5*d+5*d+1/10
-(5*d)-(5*d)-299/10-(1/10) = 0
-5*d-5*d-299/10-1/10 = 0
-10*d-30 = 0 // + 30
-10*d = 30 // : -10
d = 30/(-10)
d = -3
d = -3
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