11=-r/2

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Solution for 11=-r/2 equation: 


r in (-oo:+oo)

11 = -r/2 // + -r/2

11-(-r/2) = 0

(1/2)*r+11 = 0

1/2*r+11 = 0 // - 11

1/2*r = -11 // : 1/2

r = -11/1/2

r = -22

r = -22

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