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d in (-oo:+oo)
7*d+2/3 = 86/3 // - 86/3
7*d+2/3-(86/3) = 0
7*d+2/3-86/3 = 0
7*d-28 = 0 // + 28
7*d = 28 // : 7
d = 28/7
d = 4
d = 4
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