4x-4=9x+21

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Solution for 4x-4=9x+21 equation: 



4x-4=9x+21

We move all terms to the left:

4x-4-(9x+21)=0

We get rid of parentheses

4x-9x-21-4=0

We add all the numbers together, and all the variables

-5x-25=0

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

-5x=25

x=25/-5

x=-5

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