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225=161-x
We move all terms to the left:
225-(161-x)=0
We add all the numbers together, and all the variables
-(-1x+161)+225=0
We get rid of parentheses
1x-161+225=0
We add all the numbers together, and all the variables
x+64=0
We move all terms containing x to the left, all other terms to the right
x=-64
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