x+9-4x=21

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



x+9-4x=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-3x-12=0

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

-3x=12

x=12/-3

x=-4

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