X+2x+2x-4=21

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



X+2X+2X-4=21

We move all terms to the left:

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

We add all the numbers together, and all the variables

5X-25=0

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

5X=25

X=25/5

X=5

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