5-r/20=-4

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Solution for 5-r/20=-4 equation: 


r in (-oo:+oo)

5-(r/20) = -4 // + 4

4-(r/20)+5 = 0

9-1/20*r = 0 // - 9

-1/20*r = -9 // : -1/20

r = -9/(-1/20)

r = 180

r = 180

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