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d in (-oo:+oo)
7*(d+8) = 70 // - 70
7*(d+8)-70 = 0
7*(d+8)-70 = 0
7*d-14 = 0
7*d-14 = 0
7*d-14 = 0 // + 14
7*d = 14 // : 7
d = 14/7
d = 2
d = 2
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