-75=5(7r-1)+5(8r+1)

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Solution for -75=5(7r-1)+5(8r+1) equation: 



-75=5(7r-1)+5(8r+1)

We move all terms to the left:

-75-(5(7r-1)+5(8r+1))=0



We calculate terms in parentheses: -(5(7r-1)+5(8r+1)), so:

5(7r-1)+5(8r+1)

We multiply parentheses

35r+40r-5+5

We add all the numbers together, and all the variables

75r

Back to the equation:

-(75r)



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

-75r=75

r=75/-75

r=-1

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