100=6+2(7-5r)

Solution for 100=6+2(7-5r) equation:

100=6+2(7-5r)

We move all terms to the left:

100-(6+2(7-5r))=0

We add all the numbers together, and all the variables

-(6+2(-5r+7))+100=0


We calculate terms in parentheses: -(6+2(-5r+7)), so:

6+2(-5r+7)

determiningTheFunctionDomain
2(-5r+7)+6

We multiply parentheses

-10r+14+6

We add all the numbers together, and all the variables

-10r+20

Back to the equation:

-(-10r+20)


We get rid of parentheses

10r-20+100=0

We add all the numbers together, and all the variables

10r+80=0

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

10r=-80

r=-80/10

r=-8