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5-(3*(x/2-4)) = (1/2)*(x-8) // - (1/2)*(x-8)
5-(3*(x/2-4))-((1/2)*(x-8)) = 0
(-1/2)*(x-8)-3*(x/2-4)+5 = 0
5-3*(1/2*x-4)-1/2*(x-8) = 0
5-3*(1/2*x-4)-1/2*(x-8) = 0
5-2*x+16 = 0
21-2*x = 0
21-2*x = 0
21-2*x = 0 // - 21
-2*x = -21 // : -2
x = -21/(-2)
x = 21/2
x = 21/2
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