6a+9a=45

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Solution for 6a+9a=45 equation: 



6a+9a=45

We move all terms to the left:

6a+9a-(45)=0

We add all the numbers together, and all the variables

15a-45=0

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

15a=45

a=45/15

a=3

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