1+r/9+4

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Solution for 1+r/9+4 equation: 


r in (-oo:+oo)

r/9+1+4 = 0

1/9*r+5 = 0 // - 5

1/9*r = -5 // : 1/9

r = -5/1/9

r = -45

r = -45

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