-5/7r=-20

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Solution for -5/7r=-20 equation: 


r in (-oo:+oo)

(-5/7)*r = -20 // + 20

(-5/7)*r+20 = 0

20-5/7*r = 0 // - 20

-5/7*r = -20 // : -5/7

r = -20/(-5/7)

r = 28

r = 28

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