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214=143-x
We move all terms to the left:
214-(143-x)=0
We add all the numbers together, and all the variables
-(-1x+143)+214=0
We get rid of parentheses
1x-143+214=0
We add all the numbers together, and all the variables
x+71=0
We move all terms containing x to the left, all other terms to the right
x=-71
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