-2/5r=-4

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Solution for -2/5r=-4 equation: 


r in (-oo:+oo)

(-2/5)*r = -4 // + 4

(-2/5)*r+4 = 0

4-2/5*r = 0 // - 4

-2/5*r = -4 // : -2/5

r = -4/(-2/5)

r = 10

r = 10

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