r/2.8=4.2/4.9

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Solution for r/2.8=4.2/4.9 equation: 


r in (-oo:+oo)

r/2.8 = 4.2/4.9 // - 4.2/4.9

r/2.8-(4.2/4.9) = 0

r/2.8-0.85714286 = 0

0.35714286*r-0.85714286 = 0 // + 0.85714286

0.35714286*r = 0.85714286 // : 0.35714286

r = 0.85714286/0.35714286

r = 2.39999999

r = 2.39999999

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