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6x-340=143-x
We move all terms to the left:
6x-340-(143-x)=0
We add all the numbers together, and all the variables
6x-(-1x+143)-340=0
We get rid of parentheses
6x+1x-143-340=0
We add all the numbers together, and all the variables
7x-483=0
We move all terms containing x to the left, all other terms to the right
7x=483
x=483/7
x=69
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