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(1/8)*(a+4) = (1/6)*(6-a) // - (1/6)*(6-a)
(1/8)*(a+4)-((1/6)*(6-a)) = 0
(1/8)*(a+4)+(-1/6)*(6-a) = 0
1/8*(a+4)-1/6*(6-a) = 0
1/8*(a+4)-1/6*(6-a) = 0
7/24*a-1/2 = 0
7/24*a-1/2 = 0
7/24*a-1/2 = 0 // + 1/2
7/24*a = 1/2 // : 7/24
a = 1/2/7/24
a = 12/7
a = 12/7
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