3.x+21=39

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Solution for 3.x+21=39 equation: 



3.x+21=39

We move all terms to the left:

3.x+21-(39)=0

We add all the numbers together, and all the variables

3.x-18=0

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

3.x=18

x=18/3.

x=6

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