15=7-4(6-r)

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Solution for 15=7-4(6-r) equation: 



15=7-4(6-r)

We move all terms to the left:

15-(7-4(6-r))=0

We add all the numbers together, and all the variables

-(7-4(-1r+6))+15=0



We calculate terms in parentheses: -(7-4(-1r+6)), so:

7-4(-1r+6)

determiningTheFunctionDomain
-4(-1r+6)+7

We multiply parentheses

4r-24+7

We add all the numbers together, and all the variables

4r-17

Back to the equation:

-(4r-17)



We get rid of parentheses

-4r+17+15=0

We add all the numbers together, and all the variables

-4r+32=0

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

-4r=-32

r=-32/-4

r=+8

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