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0.4=0.61-x
We move all terms to the left:
0.4-(0.61-x)=0
We add all the numbers together, and all the variables
-(-1x+0.61)+0.4=0
We get rid of parentheses
1x-0.61+0.4=0
We add all the numbers together, and all the variables
x-0.21=0
We move all terms containing x to the left, all other terms to the right
x=0.21
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