3x-18+18=21+18

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Solution for 3x-18+18=21+18 equation: 



3x-18+18=21+18

We move all terms to the left:

3x-18+18-(21+18)=0

We add all the numbers together, and all the variables

3x-18+18-39=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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