3a+18a=81

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Solution for 3a+18a=81 equation: 



3a+18a=81

We move all terms to the left:

3a+18a-(81)=0

We add all the numbers together, and all the variables

21a-81=0

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

21a=81

a=81/21

a=3+6/7

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