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d in (-oo:+oo)
3*(2*d+8) = 84 // - 84
3*(2*d+8)-84 = 0
3*(2*d+8)-84 = 0
6*d-60 = 0
6*d-60 = 0
6*d-60 = 0 // + 60
6*d = 60 // : 6
d = 60/6
d = 10
d = 10
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