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208=145-x
We move all terms to the left:
208-(145-x)=0
We add all the numbers together, and all the variables
-(-1x+145)+208=0
We get rid of parentheses
1x-145+208=0
We add all the numbers together, and all the variables
x+63=0
We move all terms containing x to the left, all other terms to the right
x=-63
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