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6x-249=87-2x
We move all terms to the left:
6x-249-(87-2x)=0
We add all the numbers together, and all the variables
6x-(-2x+87)-249=0
We get rid of parentheses
6x+2x-87-249=0
We add all the numbers together, and all the variables
8x-336=0
We move all terms containing x to the left, all other terms to the right
8x=336
x=336/8
x=42
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