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480=a+.75a
We move all terms to the left:
480-(a+.75a)=0
We add all the numbers together, and all the variables
-(+1.75a)+480=0
We get rid of parentheses
-1.75a+480=0
We move all terms containing a to the left, all other terms to the right
-1.75a=-480
a=-480/-1.75
a=274+0.5/1.75
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