(90+40+n)=180

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Solution for (90+40+n)=180 equation: 



(90+40+n)=180

We move all terms to the left:

(90+40+n)-(180)=0

We add all the numbers together, and all the variables

(n+130)-180=0

We get rid of parentheses

n+130-180=0

We add all the numbers together, and all the variables

n-50=0

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

n=50

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