20/30=r/100

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Solution for 20/30=r/100 equation: 


r in (-oo:+oo)

20/30 = r/100 // - r/100

20/30-(r/100) = 0

2/3-1/100*r = 0 // - 2/3

-1/100*r = -2/3 // : -1/100

r = -2/3/(-1/100)

r = 200/3

r = 200/3

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