-6(-2a-1)=-90

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Solution for -6(-2a-1)=-90 equation: 



-6(-2a-1)=-90

We move all terms to the left:

-6(-2a-1)-(-90)=0

We add all the numbers together, and all the variables

-6(-2a-1)+90=0

We multiply parentheses

12a+6+90=0

We add all the numbers together, and all the variables

12a+96=0

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

12a=-96

a=-96/12

a=-8

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