1/2r=2/5

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Solution for 1/2r=2/5 equation: 


r in (-oo:+oo)

(1/2)*r = 2/5 // - 2/5

(1/2)*r-(2/5) = 0

(1/2)*r-2/5 = 0

1/2*r-2/5 = 0 // + 2/5

1/2*r = 2/5 // : 1/2

r = 2/5/1/2

r = 4/5

r = 4/5

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