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3x-19=-x+9
We move all terms to the left:
3x-19-(-x+9)=0
We add all the numbers together, and all the variables
3x-(-1x+9)-19=0
We get rid of parentheses
3x+1x-9-19=0
We add all the numbers together, and all the variables
4x-28=0
We move all terms containing x to the left, all other terms to the right
4x=28
x=28/4
x=7
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