n+(n+40)+(n-30)=150

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Solution for n+(n+40)+(n-30)=150 equation: 



n+(n+40)+(n-30)=150

We move all terms to the left:

n+(n+40)+(n-30)-(150)=0

We get rid of parentheses

n+n+n+40-30-150=0

We add all the numbers together, and all the variables

3n-140=0

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

3n=140

n=140/3

n=46+2/3

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