90=100-4n

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Solution for 90=100-4n equation: 



90=100-4n

We move all terms to the left:

90-(100-4n)=0

We add all the numbers together, and all the variables

-(-4n+100)+90=0

We get rid of parentheses

4n-100+90=0

We add all the numbers together, and all the variables

4n-10=0

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

4n=10

n=10/4

n=2+1/2

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