4a-5a-(-6a)=-15

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Solution for 4a-5a-(-6a)=-15 equation: 



4a-5a-(-6a)=-15

We move all terms to the left:

4a-5a-(-6a)-(-15)=0

We add all the numbers together, and all the variables

-1a-(-6a)+15=0

We get rid of parentheses

-1a+6a+15=0

We add all the numbers together, and all the variables

5a+15=0

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

5a=-15

a=-15/5

a=-3

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