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(x-3)+4=13
We move all terms to the left:
(x-3)+4-(13)=0
We add all the numbers together, and all the variables
(x-3)-9=0
We get rid of parentheses
x-3-9=0
We add all the numbers together, and all the variables
x-12=0
We move all terms containing x to the left, all other terms to the right
x=12
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