r/4.5=4.2/5.4

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Solution for r/4.5=4.2/5.4 equation: 


r in (-oo:+oo)

r/4.5 = 4.2/5.4 // - 4.2/5.4

r/4.5-(4.2/5.4) = 0

r/4.5-0.77777778 = 0

0.22222222*r-0.77777778 = 0 // + 0.77777778

0.22222222*r = 0.77777778 // : 0.22222222

r = 0.77777778/0.22222222

r = 3.50000005

r = 3.50000005

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