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8.4a+11=86.6
We move all terms to the left:
8.4a+11-(86.6)=0
We add all the numbers together, and all the variables
8.4a-75.6=0
We move all terms containing a to the left, all other terms to the right
8.4a=75.6
a=75.6/8.4
a=8+1/1
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