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231=x+2x
We move all terms to the left:
231-(x+2x)=0
We add all the numbers together, and all the variables
-(+3x)+231=0
We get rid of parentheses
-3x+231=0
We move all terms containing x to the left, all other terms to the right
-3x=-231
x=-231/-3
x=+77
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