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104-(5a+4a)=50
We move all terms to the left:
104-(5a+4a)-(50)=0
We add all the numbers together, and all the variables
-(+9a)+104-50=0
We add all the numbers together, and all the variables
-(+9a)+54=0
We get rid of parentheses
-9a+54=0
We move all terms containing a to the left, all other terms to the right
-9a=-54
a=-54/-9
a=+6
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