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-66=-9n+16+4
We move all terms to the left:
-66-(-9n+16+4)=0
We add all the numbers together, and all the variables
-(-9n+20)-66=0
We get rid of parentheses
9n-20-66=0
We add all the numbers together, and all the variables
9n-86=0
We move all terms containing n to the left, all other terms to the right
9n=86
n=86/9
n=9+5/9
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