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-21a+28a-6=10.3
We move all terms to the left:
-21a+28a-6-(10.3)=0
We add all the numbers together, and all the variables
7a-16.3=0
We move all terms containing a to the left, all other terms to the right
7a=16.3
a=16.3/7
a=2+2.3/7
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