1=(9.42r^2-84.73)7.8

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Solution for 1=(9.42r^2-84.73)7.8 equation: 



1=(9.42r^2-84.73)7.8

We move all terms to the left:

1-((9.42r^2-84.73)7.8)=0



We calculate terms in parentheses: -((9.42r^2-84.73)7.8), so:

(9.42r^2-84.73)7.8

We multiply parentheses

70.2r-660.894

Back to the equation:

-(70.2r-660.894)



We get rid of parentheses

-70.2r+660.894+1=0

We add all the numbers together, and all the variables

-70.2r+661.894=0

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

-70.2r=-661.894

r=-661.894/-70.2

r=9+2.9813750743/6.9546265108

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