x-21=4x-60

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Solution for x-21=4x-60 equation: 



x-21=4x-60

We move all terms to the left:

x-21-(4x-60)=0

We get rid of parentheses

x-4x+60-21=0

We add all the numbers together, and all the variables

-3x+39=0

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

-3x=-39

x=-39/-3

x=+13

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