9+12=7a

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Solution for 9+12=7a equation:



9+12=7a
We move all terms to the left:
9+12-(7a)=0
We add all the numbers together, and all the variables
-7a+21=0
We move all terms containing a to the left, all other terms to the right
-7a=-21
a=-21/-7
a=+3

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