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d in (-oo:+oo)
7-(7*d)-(4*d) = 139 // - 139
7-(7*d)-(4*d)-139 = 0
7-7*d-4*d-139 = 0
-11*d-132 = 0 // + 132
-11*d = 132 // : -11
d = 132/(-11)
d = -12
d = -12
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