n+(n-n)=3+15

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Solution for n+(n-n)=3+15 equation: 



n+(n-n)=3+15

We move all terms to the left:

n+(n-n)-(3+15)=0

We add all the numbers together, and all the variables

n+0-18=0

We add all the numbers together, and all the variables

n-18=0

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

n=18

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