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15=4-a
We move all terms to the left:
15-(4-a)=0
We add all the numbers together, and all the variables
-(-1a+4)+15=0
We get rid of parentheses
1a-4+15=0
We add all the numbers together, and all the variables
a+11=0
We move all terms containing a to the left, all other terms to the right
a=-11
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