4/5r=20

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Solution for 4/5r=20 equation: 


r in (-oo:+oo)

(4/5)*r = 20 // - 20

(4/5)*r-20 = 0

4/5*r-20 = 0 // + 20

4/5*r = 20 // : 4/5

r = 20/4/5

r = 25

r = 25

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