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(8/3)*x+(1/3)*x = 2*x+(8/3)*x+20/3 // - 2*x+(8/3)*x+20/3
(8/3)*x+(1/3)*x-(2*x)-((8/3)*x)-(20/3) = 0
(8/3)*x+(1/3)*x-2*x+(-8/3)*x-20/3 = 0
-5/3*x-20/3 = 0 // + 20/3
-5/3*x = 20/3 // : -5/3
x = 20/3/(-5/3)
x = -4
x = -4
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