Answer:
n=3
Explanation:
2n+3n-6=-21
Add 6 on both sides of the equal sign: -6+6=-21+6
2n+3n=15
Combine like terms: 2n+3n
5n=15
Divide by 5 on both sides of the equal sign: 5n/5=15/5
n=-3
add the like values and add the 6 to the -12 and decide the totals to get -3
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