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(15)=210-15A
We move all terms to the left:
(15)-(210-15A)=0
We add all the numbers together, and all the variables
-(-15A+210)+15=0
We get rid of parentheses
15A-210+15=0
We add all the numbers together, and all the variables
15A-195=0
We move all terms containing A to the left, all other terms to the right
15A=195
A=195/15
A=13
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