(-13a)-(-16a)=-9

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Solution for (-13a)-(-16a)=-9 equation: 



(-13a)-(-16a)=-9

We move all terms to the left:

(-13a)-(-16a)-(-9)=0

We add all the numbers together, and all the variables

(-13a)-(-16a)+9=0

We get rid of parentheses

-13a+16a+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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