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2*x-(2*(2*x+8/3))-6 = 4*x-1 // - 4*x-1
2*x-(2*(2*x+8/3))-(4*x)-6+1 = 0
2*x-2*(2*x+8/3)-4*x-6+1 = 0
2*x-2*(2*x+8/3)-4*x-6+1 = 0
1-2*x-4*x-6-16/3 = 0
1-6*x-6-16/3 = 0
1-6*x-34/3 = 0
-6*x-31/3 = 0
-6*x-31/3 = 0
-6*x-31/3 = 0 // + 31/3
-6*x = 31/3 // : -6
x = 31/3/(-6)
x = -31/18
x = -31/18
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