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390.29+(64.546a)=453.89
We move all terms to the left:
390.29+(64.546a)-(453.89)=0
We add all the numbers together, and all the variables
(+64.546a)+390.29-(453.89)=0
We add all the numbers together, and all the variables
(+64.546a)-63.6=0
We get rid of parentheses
64.546a-63.6=0
We move all terms containing a to the left, all other terms to the right
64.546a=63.6
a=63.6/64.546
a=39.75/40.34125
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