-15(a+8)-6a=300

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Solution for -15(a+8)-6a=300 equation: 



-15(a+8)-6a=300

We move all terms to the left:

-15(a+8)-6a-(300)=0

We add all the numbers together, and all the variables

-6a-15(a+8)-300=0

We multiply parentheses

-6a-15a-120-300=0

We add all the numbers together, and all the variables

-21a-420=0

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

-21a=420

a=420/-21

a=-20

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