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d in (-oo:+oo)
2*(6*d+1) = 86 // - 86
2*(6*d+1)-86 = 0
2*(6*d+1)-86 = 0
12*d-84 = 0
12*d-84 = 0
12*d-84 = 0 // + 84
12*d = 84 // : 12
d = 84/12
d = 7
d = 7
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