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4.2+5.2a=9.2
We move all terms to the left:
4.2+5.2a-(9.2)=0
We add all the numbers together, and all the variables
5.2a-5=0
We move all terms containing a to the left, all other terms to the right
5.2a=5
a=5/5.2
a=1/1.04
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