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21+(-6x)=x
We move all terms to the left:
21+(-6x)-(x)=0
We add all the numbers together, and all the variables
-1x+(-6x)+21=0
We get rid of parentheses
-1x-6x+21=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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