r/9-4=-5

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Solution for r/9-4=-5 equation: 


r in (-oo:+oo)

r/9-4 = -5 // + 5

r/9-4+5 = 0

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

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

r = -1/1/9

r = -9

r = -9

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