2=r/2

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Solution for 2=r/2 equation: 


r in (-oo:+oo)

2 = r/2 // - r/2

2-(r/2) = 0

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

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

r = -2/(-1/2)

r = 4

r = 4

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