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55-3a=7a-5
We move all terms to the left:
55-3a-(7a-5)=0
We get rid of parentheses
-3a-7a+5+55=0
We add all the numbers together, and all the variables
-10a+60=0
We move all terms containing a to the left, all other terms to the right
-10a=-60
a=-60/-10
a=+6
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