2/7-r/5

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Solution for 2/7-r/5 equation: 


r in (-oo:+oo)

2/7-(r/5) = 0

2/7-1/5*r = 0 // - 2/7

-1/5*r = -2/7 // : -1/5

r = -2/7/(-1/5)

r = 10/7

r = 10/7

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