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d in (-oo:+oo)
1/3-d = 19/3-7*d // - 19/3-7*d
1/3-d-(-7*d)-(19/3) = 0
7*d-d+1/3-19/3 = 0
6*d-6 = 0 // + 6
6*d = 6 // : 6
d = 6/6
d = 1
d = 1
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