4=5x-21

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Solution for 4=5x-21 equation: 



4=5x-21

We move all terms to the left:

4-(5x-21)=0

We get rid of parentheses

-5x+21+4=0

We add all the numbers together, and all the variables

-5x+25=0

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

-5x=-25

x=-25/-5

x=+5

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