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11-(x-3)=-7=28-x
We move all terms to the left:
11-(x-3)-(-7)=0
We add all the numbers together, and all the variables
-(x-3)+18=0
We get rid of parentheses
-x+3+18=0
We add all the numbers together, and all the variables
-1x+21=0
We move all terms containing x to the left, all other terms to the right
-x=-21
x=-21/-1
x=+21
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