21=3x+7

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Solution for 21=3x+7 equation: 



21=3x+7

We move all terms to the left:

21-(3x+7)=0

We get rid of parentheses

-3x-7+21=0

We add all the numbers together, and all the variables

-3x+14=0

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

-3x=-14

x=-14/-3

x=4+2/3

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