7.7a+15=107.4

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Solution for 7.7a+15=107.4 equation: 



7.7a+15=107.4

We move all terms to the left:

7.7a+15-(107.4)=0

We add all the numbers together, and all the variables

7.7a-92.4=0

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

7.7a=92.4

a=92.4/7.7

a=12

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