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55=5(10+a)
We move all terms to the left:
55-(5(10+a))=0
We add all the numbers together, and all the variables
-(5(a+10))+55=0
We calculate terms in parentheses: -(5(a+10)), so:We get rid of parentheses
5(a+10)
We multiply parentheses
5a+50
Back to the equation:
-(5a+50)
-5a-50+55=0
We add all the numbers together, and all the variables
-5a+5=0
We move all terms containing a to the left, all other terms to the right
-5a=-5
a=-5/-5
a=1
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