-3(-4a-10)=90

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Solution for -3(-4a-10)=90 equation: 



-3(-4a-10)=90

We move all terms to the left:

-3(-4a-10)-(90)=0

We multiply parentheses

12a+30-90=0

We add all the numbers together, and all the variables

12a-60=0

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

12a=60

a=60/12

a=5

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