-9+4x=-81

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Solution for -9+4x=-81 equation: 



-9+4x=-81

We move all terms to the left:

-9+4x-(-81)=0

We add all the numbers together, and all the variables

4x+72=0

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

4x=-72

x=-72/4

x=-18

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