100=-4(-7+3r)

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Solution for 100=-4(-7+3r) equation: 



100=-4(-7+3r)

We move all terms to the left:

100-(-4(-7+3r))=0

We add all the numbers together, and all the variables

-(-4(3r-7))+100=0



We calculate terms in parentheses: -(-4(3r-7)), so:

-4(3r-7)

We multiply parentheses

-12r+28

Back to the equation:

-(-12r+28)



We get rid of parentheses

12r-28+100=0

We add all the numbers together, and all the variables

12r+72=0

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

12r=-72

r=-72/12

r=-6

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