4=r/2

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Solution for 4=r/2 equation: 


r in (-oo:+oo)

4 = r/2 // - r/2

4-(r/2) = 0

4-1/2*r = 0 // - 4

-1/2*r = -4 // : -1/2

r = -4/(-1/2)

r = 8

r = 8

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