4=21x-1

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Solution for 4=21x-1 equation: 



4=21x-1

We move all terms to the left:

4-(21x-1)=0

We get rid of parentheses

-21x+1+4=0

We add all the numbers together, and all the variables

-21x+5=0

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

-21x=-5

x=-5/-21

x=5/21

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