12x+21=9x-3

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Solution for 12x+21=9x-3 equation: 



12x+21=9x-3

We move all terms to the left:

12x+21-(9x-3)=0

We get rid of parentheses

12x-9x+3+21=0

We add all the numbers together, and all the variables

3x+24=0

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

3x=-24

x=-24/3

x=-8

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