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2x+1=3x-3+9x
We move all terms to the left:
2x+1-(3x-3+9x)=0
We add all the numbers together, and all the variables
2x-(12x-3)+1=0
We get rid of parentheses
2x-12x+3+1=0
We add all the numbers together, and all the variables
-10x+4=0
We move all terms containing x to the left, all other terms to the right
-10x=-4
x=-4/-10
x=2/5
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