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54-(x-19)=31
We move all terms to the left:
54-(x-19)-(31)=0
We add all the numbers together, and all the variables
-(x-19)+23=0
We get rid of parentheses
-x+19+23=0
We add all the numbers together, and all the variables
-1x+42=0
We move all terms containing x to the left, all other terms to the right
-x=-42
x=-42/-1
x=+42
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