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6=-x+21
We move all terms to the left:
6-(-x+21)=0
We add all the numbers together, and all the variables
-(-1x+21)+6=0
We get rid of parentheses
1x-21+6=0
We add all the numbers together, and all the variables
x-15=0
We move all terms containing x to the left, all other terms to the right
x=15
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