Question

N + 30 + 2n - 10 + 70 =180​

Answer 1

n=30

Explanation:

n+30+2n-10+70=180

We move all terms to the left:

n+30+2n-10+70-(180)=0

We add all the numbers together, and all the variables

3n-90=0

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

3n=90

n=90/3

n=30