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a in (-oo:+oo)
(2*a)/3+(3*a)/6-(11/6) = a/3+9/6 // - a/3+9/6
(2*a)/3+(3*a)/6-(a/3)-(11/6)-(9/6) = 0
(2*a)/3+(3*a)/6-(a/3)-11/6-3/2 = 0
5/6*a-10/3 = 0 // + 10/3
5/6*a = 10/3 // : 5/6
a = 10/3/5/6
a = 4
a = 4
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