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d in (-oo:+oo)
2*(7*d+8) = 58 // - 58
2*(7*d+8)-58 = 0
2*(7*d+8)-58 = 0
14*d-42 = 0
14*d-42 = 0
14*d-42 = 0 // + 42
14*d = 42 // : 14
d = 42/14
d = 3
d = 3
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