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5.4=0.9a
We move all terms to the left:
5.4-(0.9a)=0
We add all the numbers together, and all the variables
-(+0.9a)+5.4=0
We get rid of parentheses
-0.9a+5.4=0
We move all terms containing a to the left, all other terms to the right
-0.9a=-5.4
a=-5.4/-0.9
a=+6
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