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=136-8.5A
We move all terms to the left:
-(136-8.5A)=0
We add all the numbers together, and all the variables
-(-8.5A+136)=0
We get rid of parentheses
8.5A-136=0
We move all terms containing A to the left, all other terms to the right
8.5A=136
A=136/8.5
A=16
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