9-8n+3n=21-87

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Solution for 9-8n+3n=21-87 equation: 



9-8n+3n=21-87

We move all terms to the left:

9-8n+3n-(21-87)=0

We add all the numbers together, and all the variables

-8n+3n+9-(-66)=0

We add all the numbers together, and all the variables

-5n+75=0

We move all terms containing n to the left, all other terms to the right

-5n=-75

n=-75/-5

n=+15

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