3x=3+18

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Solution for 3x=3+18 equation: 



3x=3+18

We move all terms to the left:

3x-(3+18)=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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