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223=45-x
We move all terms to the left:
223-(45-x)=0
We add all the numbers together, and all the variables
-(-1x+45)+223=0
We get rid of parentheses
1x-45+223=0
We add all the numbers together, and all the variables
x+178=0
We move all terms containing x to the left, all other terms to the right
x=-178
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