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4=x+2x+2
We move all terms to the left:
4-(x+2x+2)=0
We add all the numbers together, and all the variables
-(3x+2)+4=0
We get rid of parentheses
-3x-2+4=0
We add all the numbers together, and all the variables
-3x+2=0
We move all terms containing x to the left, all other terms to the right
-3x=-2
x=-2/-3
x=2/3
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