(x+9)4=120

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Solution for (x+9)4=120 equation: 



(x+9)4=120

We move all terms to the left:

(x+9)4-(120)=0

We multiply parentheses

4x+36-120=0

We add all the numbers together, and all the variables

4x-84=0

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

4x=84

x=84/4

x=21

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