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d in (-oo:+oo)
1-4*d = 7*d-87 // - 7*d-87
1-4*d-(7*d)+87 = 0
1-4*d-7*d+87 = 0
88-11*d = 0 // - 88
-11*d = -88 // : -11
d = -88/(-11)
d = 8
d = 8
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