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d in (-oo:+oo)
-(7*d)-4 = 4*d-125 // - 4*d-125
125-(7*d)-(4*d)-4 = 0
125-7*d-4*d-4 = 0
121-11*d = 0 // - 121
-11*d = -121 // : -11
d = -121/(-11)
d = 11
d = 11
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