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d in (-oo:+oo)
2*(6*d+8) = 76 // - 76
2*(6*d+8)-76 = 0
2*(6*d+8)-76 = 0
12*d-60 = 0
12*d-60 = 0
12*d-60 = 0 // + 60
12*d = 60 // : 12
d = 60/12
d = 5
d = 5
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