70=R1+R2*20/R2+20

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Solution for 70=R1+R2*20/R2+20 equation: 


D( R )

R^2 = 0

R^2 = 0

R^2 = 0

1*R^2 = 0 // : 1

R^2 = 0

R = 0

R in (-oo:0) U (0:+oo)

70 = R^1+(20*R^2)/(R^2)+20 // - R^1+(20*R^2)/(R^2)+20

70-R^1-((20*R^2)/(R^2))-20 = 0

70-R-20-20 = 0

30-R = 0 // - 30

-R = -30 // * -1

R = 30

R = 30

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