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