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-2(5r+4)=-(r-10)

We move all terms to the left:

-2(5r+4)-(-(r-10))=0

We multiply parentheses

-10r-(-(r-10))-8=0

We calculate terms in parentheses: -(-(r-10)), so:We get rid of parentheses

-(r-10)

We get rid of parentheses

-r+10

We add all the numbers together, and all the variables

-1r+10

Back to the equation:

-(-1r+10)

-10r+1r-10-8=0

We add all the numbers together, and all the variables

-9r-18=0

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

-9r=18

r=18/-9

r=-2

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