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d in (-oo:+oo)
2*(6*d+8) = 88 // - 88
2*(6*d+8)-88 = 0
2*(6*d+8)-88 = 0
12*d-72 = 0
12*d-72 = 0
12*d-72 = 0 // + 72
12*d = 72 // : 12
d = 72/12
d = 6
d = 6
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