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290=9-x
We move all terms to the left:
290-(9-x)=0
We add all the numbers together, and all the variables
-(-1x+9)+290=0
We get rid of parentheses
1x-9+290=0
We add all the numbers together, and all the variables
x+281=0
We move all terms containing x to the left, all other terms to the right
x=-281
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