7=4x+21

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Solution for 7=4x+21 equation: 



7=4x+21

We move all terms to the left:

7-(4x+21)=0

We get rid of parentheses

-4x-21+7=0

We add all the numbers together, and all the variables

-4x-14=0

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

-4x=14

x=14/-4

x=-3+1/2

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