3x=12+18

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Solution for 3x=12+18 equation: 



3x=12+18

We move all terms to the left:

3x-(12+18)=0

We add all the numbers together, and all the variables

3x-30=0

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

3x=30

x=30/3

x=10

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