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279=66-x
We move all terms to the left:
279-(66-x)=0
We add all the numbers together, and all the variables
-(-1x+66)+279=0
We get rid of parentheses
1x-66+279=0
We add all the numbers together, and all the variables
x+213=0
We move all terms containing x to the left, all other terms to the right
x=-213
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