x+2x-4x=21

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



x+2x-4x=21

We move all terms to the left:

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