9x-120=3x-30

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Solution for 9x-120=3x-30 equation: 



9x-120=3x-30

We move all terms to the left:

9x-120-(3x-30)=0

We get rid of parentheses

9x-3x+30-120=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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