-9(-2-10a)=-6(-11a+7)-12

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Solution for -9(-2-10a)=-6(-11a+7)-12 equation: 



-9(-2-10a)=-6(-11a+7)-12

We move all terms to the left:

-9(-2-10a)-(-6(-11a+7)-12)=0

We add all the numbers together, and all the variables

-9(-10a-2)-(-6(-11a+7)-12)=0

We multiply parentheses

90a-(-6(-11a+7)-12)+18=0



We calculate terms in parentheses: -(-6(-11a+7)-12), so:

-6(-11a+7)-12

We multiply parentheses

66a-42-12

We add all the numbers together, and all the variables

66a-54

Back to the equation:

-(66a-54)



We get rid of parentheses

90a-66a+54+18=0

We add all the numbers together, and all the variables

24a+72=0

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

24a=-72

a=-72/24

a=-3

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