The average of $x+6$, $6x+2$, and $2x+7$ is $4x-7$. What is $x$?
(x+6 + 6x+2 + 2x+7 )/3 = 4x-7
(9x +15)/3 = 4x-7
(9x+15) = 3(4x-7) I think you should be able to take it from here !
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