21x-9=12x-13

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Solution for 21x-9=12x-13 equation: 



21x-9=12x-13

We move all terms to the left:

21x-9-(12x-13)=0

We get rid of parentheses

21x-12x+13-9=0

We add all the numbers together, and all the variables

9x+4=0

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

9x=-4

x=-4/9

x=-4/9

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