x+21=4x-39

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Solution for x+21=4x-39 equation: 



x+21=4x-39

We move all terms to the left:

x+21-(4x-39)=0

We get rid of parentheses

x-4x+39+21=0

We add all the numbers together, and all the variables

-3x+60=0

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

-3x=-60

x=-60/-3

x=+20

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