3a+18=12

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Solution for 3a+18=12 equation: 



3a+18=12

We move all terms to the left:

3a+18-(12)=0

We add all the numbers together, and all the variables

3a+6=0

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

3a=-6

a=-6/3

a=-2

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