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19+23=20+x
We move all terms to the left:
19+23-(20+x)=0
We add all the numbers together, and all the variables
-(x+20)+19+23=0
We add all the numbers together, and all the variables
-(x+20)+42=0
We get rid of parentheses
-x-20+42=0
We add all the numbers together, and all the variables
-1x+22=0
We move all terms containing x to the left, all other terms to the right
-x=-22
x=-22/-1
x=+22
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