100=-4(7r-4)

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Solution for 100=-4(7r-4) equation: 



100=-4(7r-4)

We move all terms to the left:

100-(-4(7r-4))=0



We calculate terms in parentheses: -(-4(7r-4)), so:

-4(7r-4)

We multiply parentheses

-28r+16

Back to the equation:

-(-28r+16)



We get rid of parentheses

28r-16+100=0

We add all the numbers together, and all the variables

28r+84=0

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

28r=-84

r=-84/28

r=-3

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