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a/3+(5*a)/6-(1/6) = (2*a)/3+9/6+9/3 // - (2*a)/3+9/6+9/3
a/3+(5*a)/6-((2*a)/3)-(1/6)-(9/6)-(9/3) = 0
a/3+(5*a)/6+(-2/3)*a-1/6-3/2-3 = 0
1/2*a-14/3 = 0 // + 14/3
1/2*a = 14/3 // : 1/2
a = 14/3/1/2
a = 28/3
a = 28/3
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