4n-9=20n-137

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Solution for 4n-9=20n-137 equation: 



4n-9=20n-137

We move all terms to the left:

4n-9-(20n-137)=0

We get rid of parentheses

4n-20n+137-9=0

We add all the numbers together, and all the variables

-16n+128=0

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

-16n=-128

n=-128/-16

n=+8

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