A+(12a)+(7a)=100

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Solution for A+(12a)+(7a)=100 equation: 



+(12A)+(7A)=100

We move all terms to the left:

+(12A)+(7A)-(100)=0

We add all the numbers together, and all the variables

19A-100=0

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

19A=100

A=100/19

A=5+5/19

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