31n-90=30n-87

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Solution for 31n-90=30n-87 equation: 



31n-90=30n-87

We move all terms to the left:

31n-90-(30n-87)=0

We get rid of parentheses

31n-30n+87-90=0

We add all the numbers together, and all the variables

n-3=0

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

n=3

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