3=r/9-4

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Solution for 3=r/9-4 equation: 


r in (-oo:+oo)

3 = r/9-4 // - r/9-4

3-(r/9)+4 = 0

7-1/9*r = 0 // - 7

-1/9*r = -7 // : -1/9

r = -7/(-1/9)

r = 63

r = 63

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