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1a-15=4a-15
We move all terms to the left:
1a-15-(4a-15)=0
We add all the numbers together, and all the variables
a-(4a-15)-15=0
We get rid of parentheses
a-4a+15-15=0
We add all the numbers together, and all the variables
-3a=0
a=0/-3
a=0
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