3x+7=21x

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Solution for 3x+7=21x equation: 



3x+7=21x

We move all terms to the left:

3x+7-(21x)=0

We add all the numbers together, and all the variables

-18x+7=0

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

-18x=-7

x=-7/-18

x=7/18

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