7a-9=75

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Solution for 7a-9=75 equation: 



7a-9=75

We move all terms to the left:

7a-9-(75)=0

We add all the numbers together, and all the variables

7a-84=0

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

7a=84

a=84/7

a=12

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