r/-2=-10

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Solution for r/-2=-10 equation: 


r in (-oo:+oo)

r/(-2) = -10 // + 10

r/(-2)+10 = 0

10-1/2*r = 0 // - 10

-1/2*r = -10 // : -1/2

r = -10/(-1/2)

r = 20

r = 20

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