6(-5-3a)-7(5+8a)=9

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Solution for 6(-5-3a)-7(5+8a)=9 equation: 



6(-5-3a)-7(5+8a)=9

We move all terms to the left:

6(-5-3a)-7(5+8a)-(9)=0

We add all the numbers together, and all the variables

6(-3a-5)-7(8a+5)-9=0

We multiply parentheses

-18a-56a-30-35-9=0

We add all the numbers together, and all the variables

-74a-74=0

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

-74a=74

a=74/-74

a=-1

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