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43-25=40-x
We move all terms to the left:
43-25-(40-x)=0
We add all the numbers together, and all the variables
-(-1x+40)+43-25=0
We add all the numbers together, and all the variables
-(-1x+40)+18=0
We get rid of parentheses
1x-40+18=0
We add all the numbers together, and all the variables
x-22=0
We move all terms containing x to the left, all other terms to the right
x=22
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