15+n=18+0.90n

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Solution for 15+n=18+0.90n equation: 



15+n=18+0.90n

We move all terms to the left:

15+n-(18+0.90n)=0

We add all the numbers together, and all the variables

n-(0.90n+18)+15=0

We get rid of parentheses

n-0.90n-18+15=0

We add all the numbers together, and all the variables

0.1n-3=0

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

0.1n=3

n=3/0.1

n=30

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