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0.097=0.4a
We move all terms to the left:
0.097-(0.4a)=0
We add all the numbers together, and all the variables
-(+0.4a)+0.097=0
We get rid of parentheses
-0.4a+0.097=0
We move all terms containing a to the left, all other terms to the right
-0.4a=-0.097
a=-0.097/-0.4
a=0.097/0.4
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