3.x-15=6

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Solution for 3.x-15=6 equation: 



3.x-15=6

We move all terms to the left:

3.x-15-(6)=0

We add all the numbers together, and all the variables

3.x-21=0

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

3.x=21

x=21/3.

x=7

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