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d in (-oo:+oo)
6*d+2 = 50/7 // - 50/7
6*d-(50/7)+2 = 0
6*d-50/7+2 = 0
6*d-36/7 = 0 // + 36/7
6*d = 36/7 // : 6
d = 36/7/6
d = 6/7
d = 6/7
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