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d in (-oo:+oo)
4*(5-(2*d)) = -76 // + 76
4*(5-(2*d))+76 = 0
4*(5-2*d)+76 = 0
4*(5-2*d)+76 = 0
96-8*d = 0
96-8*d = 0
96-8*d = 0 // - 96
-8*d = -96 // : -8
d = -96/(-8)
d = 12
d = 12
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