20=40-2.5r/0.5

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Solution for 20=40-2.5r/0.5 equation: 


r in (-oo:+oo)

20 = 40-((2.5*r)/0.5) // - 40-((2.5*r)/0.5)

(2.5*r)/0.5-40+20 = 0

5*r-20 = 0 // + 20

5*r = 20 // : 5

r = 20/5

r = 4

r = 4

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