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x+2x=4+5
We move all terms to the left:
x+2x-(4+5)=0
We add all the numbers together, and all the variables
x+2x-9=0
We add all the numbers together, and all the variables
3x-9=0
We move all terms containing x to the left, all other terms to the right
3x=9
x=9/3
x=3
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