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21.8=8a+5.6
We move all terms to the left:
21.8-(8a+5.6)=0
We get rid of parentheses
-8a-5.6+21.8=0
We add all the numbers together, and all the variables
-8a+16.2=0
We move all terms containing a to the left, all other terms to the right
-8a=-16.2
a=-16.2/-8
a=2+0.2/8
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