-10a-(-12a)=-20

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Solution for -10a-(-12a)=-20 equation: 



-10a-(-12a)=-20

We move all terms to the left:

-10a-(-12a)-(-20)=0

We add all the numbers together, and all the variables

-10a-(-12a)+20=0

We get rid of parentheses

-10a+12a+20=0

We add all the numbers together, and all the variables

2a+20=0

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

2a=-20

a=-20/2

a=-10

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