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9+3x=5x+x
We move all terms to the left:
9+3x-(5x+x)=0
We add all the numbers together, and all the variables
3x-(+6x)+9=0
We get rid of parentheses
3x-6x+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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