-21-2x+4x=21

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



-21-2x+4x=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

2x-42=0

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

2x=42

x=42/2

x=21

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