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(1/4)*(a+2) = (1/2)*(7-a) // - (1/2)*(7-a)
(1/4)*(a+2)-((1/2)*(7-a)) = 0
(1/4)*(a+2)+(-1/2)*(7-a) = 0
1/4*(a+2)-1/2*(7-a) = 0
1/4*(a+2)-1/2*(7-a) = 0
3/4*a-3 = 0
3/4*a-3 = 0
3/4*a-3 = 0 // + 3
3/4*a = 3 // : 3/4
a = 3/3/4
a = 4
a = 4
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