-5.5+8.5(1+6.5r)=-21.5

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Solution for -5.5+8.5(1+6.5r)=-21.5 equation: 



-5.5+8.5(1+6.5r)=-21.5

We move all terms to the left:

-5.5+8.5(1+6.5r)-(-21.5)=0

We add all the numbers together, and all the variables

8.5(6.5r+1)-5.5-(-21.5)=0

We add all the numbers together, and all the variables

8.5(6.5r+1)+16=0

We multiply parentheses

51r+8.5+16=0

We add all the numbers together, and all the variables

51r+24.5=0

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

51r=-24.5

r=-24.5/51

r=-7/14.571428571429

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