r/2.8=2.7/2.1

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Solution for r/2.8=2.7/2.1 equation: 


r in (-oo:+oo)

r/2.8 = 2.7/2.1 // - 2.7/2.1

r/2.8-(2.7/2.1) = 0

r/2.8-1.28571429 = 0

0.35714286*r-1.28571429 = 0 // + 1.28571429

0.35714286*r = 1.28571429 // : 0.35714286

r = 1.28571429/0.35714286

r = 3.59999998

r = 3.59999998

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