-2x+4x=21-9

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Solution for -2x+4x=21-9 equation: 



-2x+4x=21-9

We move all terms to the left:

-2x+4x-(21-9)=0

We add all the numbers together, and all the variables

-2x+4x-12=0

We add all the numbers together, and all the variables

2x-12=0

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

2x=12

x=12/2

x=6

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