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213=148-x
We move all terms to the left:
213-(148-x)=0
We add all the numbers together, and all the variables
-(-1x+148)+213=0
We get rid of parentheses
1x-148+213=0
We add all the numbers together, and all the variables
x+65=0
We move all terms containing x to the left, all other terms to the right
x=-65
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