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6n+5=-3n-21-6
We move all terms to the left:
6n+5-(-3n-21-6)=0
We add all the numbers together, and all the variables
6n-(-3n-27)+5=0
We get rid of parentheses
6n+3n+27+5=0
We add all the numbers together, and all the variables
9n+32=0
We move all terms containing n to the left, all other terms to the right
9n=-32
n=-32/9
n=-3+5/9
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