20+5/2r=-20 - solution

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Solution for 20+5/2r=-20 equation:

r in (-oo:+oo)

(5/2)*r+20 = -20 // + 20

(5/2)*r+20+20 = 0

5/2*r+40 = 0 // - 40

5/2*r = -40 // : 5/2

r = -40/5/2

r = -16

r = -16

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