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d in (-oo:+oo)
2*(3*d+8) = 52 // - 52
2*(3*d+8)-52 = 0
2*(3*d+8)-52 = 0
6*d-36 = 0
6*d-36 = 0
6*d-36 = 0 // + 36
6*d = 36 // : 6
d = 36/6
d = 6
d = 6
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