10x-21=9

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Solution for 10x-21=9 equation: 



10x-21=9

We move all terms to the left:

10x-21-(9)=0

We add all the numbers together, and all the variables

10x-30=0

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

10x=30

x=30/10

x=3

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