72=4(-2+2r)+8(4-3r)

Solution for 72=4(-2+2r)+8(4-3r) equation:

72=4(-2+2r)+8(4-3r)

We move all terms to the left:

72-(4(-2+2r)+8(4-3r))=0

We add all the numbers together, and all the variables

-(4(2r-2)+8(-3r+4))+72=0


We calculate terms in parentheses: -(4(2r-2)+8(-3r+4)), so:

4(2r-2)+8(-3r+4)

We multiply parentheses

8r-24r-8+32

We add all the numbers together, and all the variables

-16r+24

Back to the equation:

-(-16r+24)


We get rid of parentheses

16r-24+72=0

We add all the numbers together, and all the variables

16r+48=0

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

16r=-48

r=-48/16

r=-3