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d in (-oo:+oo)
108 = (8*d)/13+12 // - (8*d)/13+12
108-((8*d)/13)-12 = 0
(-8/13)*d-12+108 = 0
96-8/13*d = 0 // - 96
-8/13*d = -96 // : -8/13
d = -96/(-8/13)
d = 156
d = 156
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