100=-5(-5-5a)-5a

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Solution for 100=-5(-5-5a)-5a equation: 



100=-5(-5-5a)-5a

We move all terms to the left:

100-(-5(-5-5a)-5a)=0

We add all the numbers together, and all the variables

-(-5(-5a-5)-5a)+100=0



We calculate terms in parentheses: -(-5(-5a-5)-5a), so:

-5(-5a-5)-5a

We add all the numbers together, and all the variables

-5a-5(-5a-5)

We multiply parentheses

-5a+25a+25

We add all the numbers together, and all the variables

20a+25

Back to the equation:

-(20a+25)



We get rid of parentheses

-20a-25+100=0

We add all the numbers together, and all the variables

-20a+75=0

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

-20a=-75

a=-75/-20

a=3+3/4

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