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290=218-x
We move all terms to the left:
290-(218-x)=0
We add all the numbers together, and all the variables
-(-1x+218)+290=0
We get rid of parentheses
1x-218+290=0
We add all the numbers together, and all the variables
x+72=0
We move all terms containing x to the left, all other terms to the right
x=-72
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