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43=15-n
We move all terms to the left:
43-(15-n)=0
We add all the numbers together, and all the variables
-(-1n+15)+43=0
We get rid of parentheses
1n-15+43=0
We add all the numbers together, and all the variables
n+28=0
We move all terms containing n to the left, all other terms to the right
n=-28
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