6x+21=9x+3

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Solution for 6x+21=9x+3 equation: 



6x+21=9x+3

We move all terms to the left:

6x+21-(9x+3)=0

We get rid of parentheses

6x-9x-3+21=0

We add all the numbers together, and all the variables

-3x+18=0

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

-3x=-18

x=-18/-3

x=+6

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