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0.2a+4(2)+4a=5a
We move all terms to the left:
0.2a+4(2)+4a-(5a)=0
We add all the numbers together, and all the variables
-0.8a+42=0
We move all terms containing a to the left, all other terms to the right
-0.8a=-42
a=-42/-0.8
a=52+0.4/0.8
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