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290=x-10-300
We move all terms to the left:
290-(x-10-300)=0
We add all the numbers together, and all the variables
-(x-310)+290=0
We get rid of parentheses
-x+310+290=0
We add all the numbers together, and all the variables
-1x+600=0
We move all terms containing x to the left, all other terms to the right
-x=-600
x=-600/-1
x=+600
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