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-55=5+3a
We move all terms to the left:
-55-(5+3a)=0
We add all the numbers together, and all the variables
-(3a+5)-55=0
We get rid of parentheses
-3a-5-55=0
We add all the numbers together, and all the variables
-3a-60=0
We move all terms containing a to the left, all other terms to the right
-3a=60
a=60/-3
a=-20
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