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9+(x-5)=12
We move all terms to the left:
9+(x-5)-(12)=0
We add all the numbers together, and all the variables
(x-5)-3=0
We get rid of parentheses
x-5-3=0
We add all the numbers together, and all the variables
x-8=0
We move all terms containing x to the left, all other terms to the right
x=8
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