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x+x+3=3x-1
We move all terms to the left:
x+x+3-(3x-1)=0
We add all the numbers together, and all the variables
2x-(3x-1)+3=0
We get rid of parentheses
2x-3x+1+3=0
We add all the numbers together, and all the variables
-1x+4=0
We move all terms containing x to the left, all other terms to the right
-x=-4
x=-4/-1
x=+4
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