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