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a in (-oo:+oo)
2*a+1/6 = 5/6 // - 5/6
2*a+1/6-(5/6) = 0
2*a+1/6-5/6 = 0
2*a-2/3 = 0 // + 2/3
2*a = 2/3 // : 2
a = 2/3/2
a = 1/3
a = 1/3
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