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6x+39=143-7x
We move all terms to the left:
6x+39-(143-7x)=0
We add all the numbers together, and all the variables
6x-(-7x+143)+39=0
We get rid of parentheses
6x+7x-143+39=0
We add all the numbers together, and all the variables
13x-104=0
We move all terms containing x to the left, all other terms to the right
13x=104
x=104/13
x=8
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