3a+2(a-9)=12

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Solution for 3a+2(a-9)=12 equation: 



3a+2(a-9)=12

We move all terms to the left:

3a+2(a-9)-(12)=0

We multiply parentheses

3a+2a-18-12=0

We add all the numbers together, and all the variables

5a-30=0

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

5a=30

a=30/5

a=6

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