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879+8x=135+39x
We move all terms to the left:
879+8x-(135+39x)=0
We add all the numbers together, and all the variables
8x-(39x+135)+879=0
We get rid of parentheses
8x-39x-135+879=0
We add all the numbers together, and all the variables
-31x+744=0
We move all terms containing x to the left, all other terms to the right
-31x=-744
x=-744/-31
x=+24
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