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228=115-x
We move all terms to the left:
228-(115-x)=0
We add all the numbers together, and all the variables
-(-1x+115)+228=0
We get rid of parentheses
1x-115+228=0
We add all the numbers together, and all the variables
x+113=0
We move all terms containing x to the left, all other terms to the right
x=-113
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