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6n+9+n+10=199-5n
We move all terms to the left:
6n+9+n+10-(199-5n)=0
We add all the numbers together, and all the variables
6n+n-(-5n+199)+9+10=0
We add all the numbers together, and all the variables
7n-(-5n+199)+19=0
We get rid of parentheses
7n+5n-199+19=0
We add all the numbers together, and all the variables
12n-180=0
We move all terms containing n to the left, all other terms to the right
12n=180
n=180/12
n=15
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