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x+9+2x=4+2x+9
We move all terms to the left:
x+9+2x-(4+2x+9)=0
We add all the numbers together, and all the variables
x+2x-(2x+13)+9=0
We add all the numbers together, and all the variables
3x-(2x+13)+9=0
We get rid of parentheses
3x-2x-13+9=0
We add all the numbers together, and all the variables
x-4=0
We move all terms containing x to the left, all other terms to the right
x=4
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