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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(7r-4(-1r+3))-100=0



We calculate terms in parentheses: -(7r-4(-1r+3)), so:

7r-4(-1r+3)

We multiply parentheses

7r+4r-12

We add all the numbers together, and all the variables

11r-12

Back to the equation:

-(11r-12)



We get rid of parentheses

-11r+12-100=0

We add all the numbers together, and all the variables

-11r-88=0

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

-11r=88

r=88/-11

r=-8

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