11+12a=9a-13

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Solution for 11+12a=9a-13 equation: 



11+12a=9a-13

We move all terms to the left:

11+12a-(9a-13)=0

We get rid of parentheses

12a-9a+13+11=0

We add all the numbers together, and all the variables

3a+24=0

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

3a=-24

a=-24/3

a=-8

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