7=21x+3

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Solution for 7=21x+3 equation: 



7=21x+3

We move all terms to the left:

7-(21x+3)=0

We get rid of parentheses

-21x-3+7=0

We add all the numbers together, and all the variables

-21x+4=0

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

-21x=-4

x=-4/-21

x=4/21

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