-20=-(1-5r)+2(1-4r)

Solution for -20=-(1-5r)+2(1-4r) equation:

-20=-(1-5r)+2(1-4r)

We move all terms to the left:

-20-(-(1-5r)+2(1-4r))=0

We add all the numbers together, and all the variables

-(-(-5r+1)+2(-4r+1))-20=0


We calculate terms in parentheses: -(-(-5r+1)+2(-4r+1)), so:

-(-5r+1)+2(-4r+1)

We multiply parentheses

-(-5r+1)-8r+2

We get rid of parentheses

5r-8r-1+2

We add all the numbers together, and all the variables

-3r+1

Back to the equation:

-(-3r+1)


We get rid of parentheses

3r-1-20=0

We add all the numbers together, and all the variables

3r-21=0

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

3r=21

r=21/3

r=7