15n+15=20n-40

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Solution for 15n+15=20n-40 equation: 



15n+15=20n-40

We move all terms to the left:

15n+15-(20n-40)=0

We get rid of parentheses

15n-20n+40+15=0

We add all the numbers together, and all the variables

-5n+55=0

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

-5n=-55

n=-55/-5

n=+11

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