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-x+9+7(x-4)=2-x
We move all terms to the left:
-x+9+7(x-4)-(2-x)=0
We add all the numbers together, and all the variables
-x+7(x-4)-(-1x+2)+9=0
We add all the numbers together, and all the variables
-1x+7(x-4)-(-1x+2)+9=0
We multiply parentheses
-1x+7x-(-1x+2)-28+9=0
We get rid of parentheses
-1x+7x+1x-2-28+9=0
We add all the numbers together, and all the variables
7x-21=0
We move all terms containing x to the left, all other terms to the right
7x=21
x=21/7
x=3
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