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30.98=40-x
We move all terms to the left:
30.98-(40-x)=0
We add all the numbers together, and all the variables
-(-1x+40)+30.98=0
We get rid of parentheses
1x-40+30.98=0
We add all the numbers together, and all the variables
x-9.02=0
We move all terms containing x to the left, all other terms to the right
x=9.02
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