3(a+4)-9=6

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Solution for 3(a+4)-9=6 equation: 



3(a+4)-9=6

We move all terms to the left:

3(a+4)-9-(6)=0

We add all the numbers together, and all the variables

3(a+4)-15=0

We multiply parentheses

3a+12-15=0

We add all the numbers together, and all the variables

3a-3=0

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

3a=3

a=3/3

a=1

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