9x-90=3x

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Solution for 9x-90=3x equation: 



9x-90=3x

We move all terms to the left:

9x-90-(3x)=0

We add all the numbers together, and all the variables

6x-90=0

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

6x=90

x=90/6

x=15

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