3a+6a+9=90

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Solution for 3a+6a+9=90 equation: 



3a+6a+9=90

We move all terms to the left:

3a+6a+9-(90)=0

We add all the numbers together, and all the variables

9a-81=0

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

9a=81

a=81/9

a=9

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