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-x+21=11+17
We move all terms to the left:
-x+21-(11+17)=0
We add all the numbers together, and all the variables
-x+21-28=0
We add all the numbers together, and all the variables
-1x-7=0
We move all terms containing x to the left, all other terms to the right
-x=7
x=7/-1
x=-7
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