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