-4=r/2

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Solution for -4=r/2 equation: 


r in (-oo:+oo)

-4 = r/2 // - r/2

-(r/2)-4 = 0

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

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

r = 4/(-1/2)

r = -8

r = -8

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