x(-4)=81

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Solution for x(-4)=81 equation: 



x(-4)=81

We move all terms to the left:

x(-4)-(81)=0

We multiply parentheses

-4x-81=0

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

-4x=81

x=81/-4

x=-20+1/4

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