3x-21=6x+36

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Solution for 3x-21=6x+36 equation: 



3x-21=6x+36

We move all terms to the left:

3x-21-(6x+36)=0

We get rid of parentheses

3x-6x-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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