2/5r=20

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Solution for 2/5r=20 equation: 


r in (-oo:+oo)

(2/5)*r = 20 // - 20

(2/5)*r-20 = 0

2/5*r-20 = 0 // + 20

2/5*r = 20 // : 2/5

r = 20/2/5

r = 50

r = 50

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