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x-9=-3x-1
We move all terms to the left:
x-9-(-3x-1)=0
We get rid of parentheses
x+3x+1-9=0
We add all the numbers together, and all the variables
4x-8=0
We move all terms containing x to the left, all other terms to the right
4x=8
x=8/4
x=2
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