2r-2/5=r/7

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Solution for 2r-2/5=r/7 equation: 


r in (-oo:+oo)

2*r-(2/5) = r/7 // - r/7

2*r-(r/7)-(2/5) = 0

2*r-(r/7)-2/5 = 0

13/7*r-2/5 = 0 // + 2/5

13/7*r = 2/5 // : 13/7

r = 2/5/13/7

r = 14/65

r = 14/65

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