-5(-4a-5)=105

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Solution for -5(-4a-5)=105 equation: 



-5(-4a-5)=105

We move all terms to the left:

-5(-4a-5)-(105)=0

We multiply parentheses

20a+25-105=0

We add all the numbers together, and all the variables

20a-80=0

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

20a=80

a=80/20

a=4

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