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19+9n=6n-20
We move all terms to the left:
19+9n-(6n-20)=0
We get rid of parentheses
9n-6n+20+19=0
We add all the numbers together, and all the variables
3n+39=0
We move all terms containing n to the left, all other terms to the right
3n=-39
n=-39/3
n=-13
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