r/9-1=-4 - solution

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Solution for r/9-1=-4 equation:

r in (-oo:+oo)

r/9-1 = -4 // + 4

r/9-1+4 = 0

1/9*r+3 = 0 // - 3

1/9*r = -3 // : 1/9

r = -3/1/9

r = -27

r = -27

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