x+21=4x-36

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Solution for x+21=4x-36 equation: 



x+21=4x-36

We move all terms to the left:

x+21-(4x-36)=0

We get rid of parentheses

x-4x+36+21=0

We add all the numbers together, and all the variables

-3x+57=0

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

-3x=-57

x=-57/-3

x=+19

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