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2a+15-5=7a-5+15
We move all terms to the left:
2a+15-5-(7a-5+15)=0
We add all the numbers together, and all the variables
2a-(7a+10)+15-5=0
We add all the numbers together, and all the variables
2a-(7a+10)+10=0
We get rid of parentheses
2a-7a-10+10=0
We add all the numbers together, and all the variables
-5a=0
a=0/-5
a=0
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