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-2+3=2x+21
We move all terms to the left:
-2+3-(2x+21)=0
We add all the numbers together, and all the variables
-(2x+21)+1=0
We get rid of parentheses
-2x-21+1=0
We add all the numbers together, and all the variables
-2x-20=0
We move all terms containing x to the left, all other terms to the right
-2x=20
x=20/-2
x=-10
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