2/5r-9=1

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Solution for 2/5r-9=1 equation: 


r in (-oo:+oo)

(2/5)*r-9 = 1 // - 1

(2/5)*r-9-1 = 0

2/5*r-10 = 0 // + 10

2/5*r = 10 // : 2/5

r = 10/2/5

r = 25

r = 25

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