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291=2x+x
We move all terms to the left:
291-(2x+x)=0
We add all the numbers together, and all the variables
-(+3x)+291=0
We get rid of parentheses
-3x+291=0
We move all terms containing x to the left, all other terms to the right
-3x=-291
x=-291/-3
x=+97
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