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7+9/a=10

We move all terms to the left:

7+9/a-(10)=0

Domain of the equation: a!=0We add all the numbers together, and all the variables

a∈R

9/a-3=0

We multiply all the terms by the denominator

-3*a+9=0

We add all the numbers together, and all the variables

-3a+9=0

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

-3a=-9

a=-9/-3

a=+3

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