7x-20=9x

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Solution for 7x-20=9x equation: 



7x-20=9x

We move all terms to the left:

7x-20-(9x)=0

We add all the numbers together, and all the variables

-2x-20=0

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

-2x=20

x=20/-2

x=-10

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