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a+a-25+10=a+99
We move all terms to the left:
a+a-25+10-(a+99)=0
We add all the numbers together, and all the variables
2a-(a+99)-15=0
We get rid of parentheses
2a-a-99-15=0
We add all the numbers together, and all the variables
a-114=0
We move all terms containing a to the left, all other terms to the right
a=114
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