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3(x-7)+2x=9-x
We move all terms to the left:
3(x-7)+2x-(9-x)=0
We add all the numbers together, and all the variables
3(x-7)+2x-(-1x+9)=0
We add all the numbers together, and all the variables
2x+3(x-7)-(-1x+9)=0
We multiply parentheses
2x+3x-(-1x+9)-21=0
We get rid of parentheses
2x+3x+1x-9-21=0
We add all the numbers together, and all the variables
6x-30=0
We move all terms containing x to the left, all other terms to the right
6x=30
x=30/6
x=5
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