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(2a-20.1)=(a+1.9)
We move all terms to the left:
(2a-20.1)-((a+1.9))=0
We get rid of parentheses
2a-((a+1.9))-20.1=0
We calculate terms in parentheses: -((a+1.9)), so:We get rid of parentheses
(a+1.9)
We get rid of parentheses
a+1.9
Back to the equation:
-(a+1.9)
2a-a-1.9-20.1=0
We add all the numbers together, and all the variables
a-22=0
We move all terms containing a to the left, all other terms to the right
a=22
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