3a+6a=100

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Solution for 3a+6a=100 equation: 



3a+6a=100

We move all terms to the left:

3a+6a-(100)=0

We add all the numbers together, and all the variables

9a-100=0

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

9a=100

a=100/9

a=11+1/9

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