-212.21=6.5(-6.6-7.8r)-2

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Solution for -212.21=6.5(-6.6-7.8r)-2 equation: 



-212.21=6.5(-6.6-7.8r)-2

We move all terms to the left:

-212.21-(6.5(-6.6-7.8r)-2)=0

We add all the numbers together, and all the variables

-(6.5(-7.8r-6.6)-2)-212.21=0



We calculate terms in parentheses: -(6.5(-7.8r-6.6)-2), so:

6.5(-7.8r-6.6)-2

We multiply parentheses

-45.5r-42.9-2

We add all the numbers together, and all the variables

-45.5r-44.9

Back to the equation:

-(-45.5r-44.9)



We get rid of parentheses

45.5r+44.9-212.21=0

We add all the numbers together, and all the variables

45.5r-167.31=0

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

45.5r=167.31

r=167.31/45.5

r=3+1.9487666034156/2.8779253636939

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