10x-21=6x-9

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Solution for 10x-21=6x-9 equation: 



10x-21=6x-9

We move all terms to the left:

10x-21-(6x-9)=0

We get rid of parentheses

10x-6x+9-21=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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