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7=3x-9-4x+13
We move all terms to the left:
7-(3x-9-4x+13)=0
We add all the numbers together, and all the variables
-(-1x+4)+7=0
We get rid of parentheses
1x-4+7=0
We add all the numbers together, and all the variables
x+3=0
We move all terms containing x to the left, all other terms to the right
x=-3
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