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19=-8+9n
We move all terms to the left:
19-(-8+9n)=0
We add all the numbers together, and all the variables
-(9n-8)+19=0
We get rid of parentheses
-9n+8+19=0
We add all the numbers together, and all the variables
-9n+27=0
We move all terms containing n to the left, all other terms to the right
-9n=-27
n=-27/-9
n=+3
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