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19-3x=-x+21
We move all terms to the left:
19-3x-(-x+21)=0
We add all the numbers together, and all the variables
-3x-(-1x+21)+19=0
We get rid of parentheses
-3x+1x-21+19=0
We add all the numbers together, and all the variables
-2x-2=0
We move all terms containing x to the left, all other terms to the right
-2x=2
x=2/-2
x=-1
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