3x=18+21

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Solution for 3x=18+21 equation: 



3x=18+21

We move all terms to the left:

3x-(18+21)=0

We add all the numbers together, and all the variables

3x-39=0

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

3x=39

x=39/3

x=13

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