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-0x=0x-21
We move all terms to the left:
-0x-(0x-21)=0
We add all the numbers together, and all the variables
-0x-(x-21)=0
We add all the numbers together, and all the variables
-1x-(x-21)=0
We get rid of parentheses
-1x-x+21=0
We add all the numbers together, and all the variables
-2x+21=0
We move all terms containing x to the left, all other terms to the right
-2x=-21
x=-21/-2
x=10+1/2
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