12x=5x-21

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Solution for 12x=5x-21 equation: 



12x=5x-21

We move all terms to the left:

12x-(5x-21)=0

We get rid of parentheses

12x-5x+21=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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