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4a-25+3a=a-5+a
We move all terms to the left:
4a-25+3a-(a-5+a)=0
We add all the numbers together, and all the variables
4a+3a-(2a-5)-25=0
We add all the numbers together, and all the variables
7a-(2a-5)-25=0
We get rid of parentheses
7a-2a+5-25=0
We add all the numbers together, and all the variables
5a-20=0
We move all terms containing a to the left, all other terms to the right
5a=20
a=20/5
a=4
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