7a+9=10a

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Solution for 7a+9=10a equation: 



7a+9=10a

We move all terms to the left:

7a+9-(10a)=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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