21x-7=391

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Solution for 21x-7=391 equation: 



21x-7=391

We move all terms to the left:

21x-7-(391)=0

We add all the numbers together, and all the variables

21x-398=0

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

21x=398

x=398/21

x=18+20/21

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