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d in (-oo:+oo)
-77 = 5*d+5*d+3 // - 5*d+5*d+3
-(5*d)-(5*d)-77-3 = 0
-5*d-5*d-77-3 = 0
-10*d-80 = 0 // + 80
-10*d = 80 // : -10
d = 80/(-10)
d = -8
d = -8
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