21x=x-12

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Solution for 21x=x-12 equation: 



21x=x-12

We move all terms to the left:

21x-(x-12)=0

We get rid of parentheses

21x-x+12=0

We add all the numbers together, and all the variables

20x+12=0

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

20x=-12

x=-12/20

x=-3/5

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