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63=198-x
We move all terms to the left:
63-(198-x)=0
We add all the numbers together, and all the variables
-(-1x+198)+63=0
We get rid of parentheses
1x-198+63=0
We add all the numbers together, and all the variables
x-135=0
We move all terms containing x to the left, all other terms to the right
x=135
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