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-x-3=2x+21
We move all terms to the left:
-x-3-(2x+21)=0
We add all the numbers together, and all the variables
-1x-(2x+21)-3=0
We get rid of parentheses
-1x-2x-21-3=0
We add all the numbers together, and all the variables
-3x-24=0
We move all terms containing x to the left, all other terms to the right
-3x=24
x=24/-3
x=-8
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