12a+8a=100

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Solution for 12a+8a=100 equation: 



12a+8a=100

We move all terms to the left:

12a+8a-(100)=0

We add all the numbers together, and all the variables

20a-100=0

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

20a=100

a=100/20

a=5

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