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1+2=3x+0
We move all terms to the left:
1+2-(3x+0)=0
We add all the numbers together, and all the variables
-(+3x)+1+2=0
We add all the numbers together, and all the variables
-(+3x)+3=0
We get rid of parentheses
-3x+3=0
We move all terms containing x to the left, all other terms to the right
-3x=-3
x=-3/-3
x=1
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