3x-9=120

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Solution for 3x-9=120 equation: 



3x-9=120

We move all terms to the left:

3x-9-(120)=0

We add all the numbers together, and all the variables

3x-129=0

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

3x=129

x=129/3

x=43

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