-a-(-3a)+-16=-4

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Solution for -a-(-3a)+-16=-4 equation: 



-a-(-3a)+-16=-4

We move all terms to the left:

-a-(-3a)+-16-(-4)=0

We add all the numbers together, and all the variables

-1a-(-3a)-12=0

We get rid of parentheses

-1a+3a-12=0

We add all the numbers together, and all the variables

2a-12=0

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

2a=12

a=12/2

a=6

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