9A+12b=28.5

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Solution for 9A+12b=28.5 equation: 



9+12A=28.5

We move all terms to the left:

9+12A-(28.5)=0

We add all the numbers together, and all the variables

12A-19.5=0

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

12A=19.5

A=19.5/12

A=1+5/8

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