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.5.2=a-0.4
We move all terms to the left:
.5.2-(a-0.4)=0
We add all the numbers together, and all the variables
-(a-0.4)+0.1=0
We get rid of parentheses
-a+0.4+0.1=0
We add all the numbers together, and all the variables
-1a+0.5=0
We move all terms containing a to the left, all other terms to the right
-a=-0.5
a=-0.5/-1
a=0.5/1
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