720=-3r-10(-7r-5)

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Solution for 720=-3r-10(-7r-5) equation: 



720=-3r-10(-7r-5)

We move all terms to the left:

720-(-3r-10(-7r-5))=0



We calculate terms in parentheses: -(-3r-10(-7r-5)), so:

-3r-10(-7r-5)

We multiply parentheses

-3r+70r+50

We add all the numbers together, and all the variables

67r+50

Back to the equation:

-(67r+50)



We get rid of parentheses

-67r-50+720=0

We add all the numbers together, and all the variables

-67r+670=0

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

-67r=-670

r=-670/-67

r=+10

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