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3n=43-40n
We move all terms to the left:
3n-(43-40n)=0
We add all the numbers together, and all the variables
3n-(-40n+43)=0
We get rid of parentheses
3n+40n-43=0
We add all the numbers together, and all the variables
43n-43=0
We move all terms containing n to the left, all other terms to the right
43n=43
n=43/43
n=1
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