21=7x-4

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Solution for 21=7x-4 equation: 



21=7x-4

We move all terms to the left:

21-(7x-4)=0

We get rid of parentheses

-7x+4+21=0

We add all the numbers together, and all the variables

-7x+25=0

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

-7x=-25

x=-25/-7

x=3+4/7

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