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1a-15=4a-3=
We move all terms to the left:
1a-15-(4a-3)=0
We add all the numbers together, and all the variables
a-(4a-3)-15=0
We get rid of parentheses
a-4a+3-15=0
We add all the numbers together, and all the variables
-3a-12=0
We move all terms containing a to the left, all other terms to the right
-3a=12
a=12/-3
a=-4
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