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3x-9+4x=11+5x
We move all terms to the left:
3x-9+4x-(11+5x)=0
We add all the numbers together, and all the variables
3x+4x-(5x+11)-9=0
We add all the numbers together, and all the variables
7x-(5x+11)-9=0
We get rid of parentheses
7x-5x-11-9=0
We add all the numbers together, and all the variables
2x-20=0
We move all terms containing x to the left, all other terms to the right
2x=20
x=20/2
x=10
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