3a-12=18

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Solution for 3a-12=18 equation: 



3a-12=18

We move all terms to the left:

3a-12-(18)=0

We add all the numbers together, and all the variables

3a-30=0

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

3a=30

a=30/3

a=10

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