13=-r/2

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Solution for 13=-r/2 equation: 


r in (-oo:+oo)

13 = -r/2 // + -r/2

13-(-r/2) = 0

(1/2)*r+13 = 0

1/2*r+13 = 0 // - 13

1/2*r = -13 // : 1/2

r = -13/1/2

r = -26

r = -26

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