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a in (-oo:+oo)
a/3+(5*a)/6-(1/6) = 2*a+a/3+9/6 // - 2*a+a/3+9/6
a/3+(5*a)/6-(2*a)-(a/3)-(1/6)-(9/6) = 0
a/3+(5*a)/6-2*a-(a/3)-1/6-3/2 = 0
-7/6*a-5/3 = 0 // + 5/3
-7/6*a = 5/3 // : -7/6
a = 5/3/(-7/6)
a = -10/7
a = -10/7
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