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42.40=1.06a
We move all terms to the left:
42.40-(1.06a)=0
We add all the numbers together, and all the variables
-(+1.06a)+42.40=0
We add all the numbers together, and all the variables
-(+1.06a)+42.4=0
We get rid of parentheses
-1.06a+42.4=0
We move all terms containing a to the left, all other terms to the right
-1.06a=-42.4
a=-42.4/-1.06
a=40+-7.105427357601E-15/1.06
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