r/2.1=4.2/4.9

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Solution for r/2.1=4.2/4.9 equation: 


r in (-oo:+oo)

r/2.1 = 4.2/4.9 // - 4.2/4.9

r/2.1-(4.2/4.9) = 0

r/2.1-0.85714286 = 0

0.47619048*r-0.85714286 = 0 // + 0.85714286

0.47619048*r = 0.85714286 // : 0.47619048

r = 0.85714286/0.47619048

r = 1.79999999

r = 1.79999999

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