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(1/9)*(a+3) = (1/2)*(4-a) // - (1/2)*(4-a)
(1/9)*(a+3)-((1/2)*(4-a)) = 0
(1/9)*(a+3)+(-1/2)*(4-a) = 0
1/9*(a+3)-1/2*(4-a) = 0
1/9*(a+3)-1/2*(4-a) = 0
11/18*a-5/3 = 0
11/18*a-5/3 = 0
11/18*a-5/3 = 0 // + 5/3
11/18*a = 5/3 // : 11/18
a = 5/3/11/18
a = 30/11
a = 30/11
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