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(1/2)*(6-x) = 2*x // - 2*x
(1/2)*(6-x)-(2*x) = 0
(1/2)*(6-x)-2*x = 0
1/2*(6-x)-2*x = 0
1/2*(6-x)-2*x = 0
3-5/2*x = 0
3-5/2*x = 0
3-5/2*x = 0 // - 3
-5/2*x = -3 // : -5/2
x = -3/(-5/2)
x = 6/5
x = 6/5
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