-78=-2(1-2r)-8(4-5r)

Solution for -78=-2(1-2r)-8(4-5r) equation:

-78=-2(1-2r)-8(4-5r)

We move all terms to the left:

-78-(-2(1-2r)-8(4-5r))=0

We add all the numbers together, and all the variables

-(-2(-2r+1)-8(-5r+4))-78=0


We calculate terms in parentheses: -(-2(-2r+1)-8(-5r+4)), so:

-2(-2r+1)-8(-5r+4)

We multiply parentheses

4r+40r-2-32

We add all the numbers together, and all the variables

44r-34

Back to the equation:

-(44r-34)


We get rid of parentheses

-44r+34-78=0

We add all the numbers together, and all the variables

-44r-44=0

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

-44r=44

r=44/-44

r=-1