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355+9x=229+12x
We move all terms to the left:
355+9x-(229+12x)=0
We add all the numbers together, and all the variables
9x-(12x+229)+355=0
We get rid of parentheses
9x-12x-229+355=0
We add all the numbers together, and all the variables
-3x+126=0
We move all terms containing x to the left, all other terms to the right
-3x=-126
x=-126/-3
x=+42
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