90=-1-7n

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Solution for 90=-1-7n equation:



90=-1-7n
We move all terms to the left:
90-(-1-7n)=0
We add all the numbers together, and all the variables
-(-7n-1)+90=0
We get rid of parentheses
7n+1+90=0
We add all the numbers together, and all the variables
7n+91=0
We move all terms containing n to the left, all other terms to the right
7n=-91
n=-91/7
n=-13

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