4x-9=5x+12

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Solution for 4x-9=5x+12 equation: 



4x-9=5x+12

We move all terms to the left:

4x-9-(5x+12)=0

We get rid of parentheses

4x-5x-12-9=0

We add all the numbers together, and all the variables

-1x-21=0

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

-x=21

x=21/-1

x=-21

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