11x-21=13x+9

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Solution for 11x-21=13x+9 equation: 



11x-21=13x+9

We move all terms to the left:

11x-21-(13x+9)=0

We get rid of parentheses

11x-13x-9-21=0

We add all the numbers together, and all the variables

-2x-30=0

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

-2x=30

x=30/-2

x=-15

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