-100=5(1-7a)

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Solution for -100=5(1-7a) equation: 



-100=5(1-7a)

We move all terms to the left:

-100-(5(1-7a))=0

We add all the numbers together, and all the variables

-(5(-7a+1))-100=0



We calculate terms in parentheses: -(5(-7a+1)), so:

5(-7a+1)

We multiply parentheses

-35a+5

Back to the equation:

-(-35a+5)



We get rid of parentheses

35a-5-100=0

We add all the numbers together, and all the variables

35a-105=0

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

35a=105

a=105/35

a=3

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