-20=(x+7)4

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Solution for -20=(x+7)4 equation: 



-20=(x+7)4

We move all terms to the left:

-20-((x+7)4)=0



We calculate terms in parentheses: -((x+7)4), so:

(x+7)4

We multiply parentheses

4x+28

Back to the equation:

-(4x+28)



We get rid of parentheses

-4x-28-20=0

We add all the numbers together, and all the variables

-4x-48=0

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

-4x=48

x=48/-4

x=-12

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