r/5-4/7

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Solution for r/5-4/7 equation: 


r in (-oo:+oo)

r/5-(4/7) = 0

r/5-4/7 = 0

1/5*r-4/7 = 0 // + 4/7

1/5*r = 4/7 // : 1/5

r = 4/7/1/5

r = 20/7

r = 20/7

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