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0.15a+28.1=50
We move all terms to the left:
0.15a+28.1-(50)=0
We add all the numbers together, and all the variables
0.15a-21.9=0
We move all terms containing a to the left, all other terms to the right
0.15a=21.9
a=21.9/0.15
a=146
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