n*5+12=87

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Solution for n*5+12=87 equation: 



n*5+12=87

We move all terms to the left:

n*5+12-(87)=0

We add all the numbers together, and all the variables

n*5-75=0

Wy multiply elements

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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