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3.15=0.45a
We move all terms to the left:
3.15-(0.45a)=0
We add all the numbers together, and all the variables
-(+0.45a)+3.15=0
We get rid of parentheses
-0.45a+3.15=0
We move all terms containing a to the left, all other terms to the right
-0.45a=-3.15
a=-3.15/-0.45
a=+7
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