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

6x-12=0

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

6x=12

x=12/6

x=2

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