2=r/3-1

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Solution for 2=r/3-1 equation: 


r in (-oo:+oo)

2 = r/3-1 // - r/3-1

1-(r/3)+2 = 0

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

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

r = -3/(-1/3)

r = 9

r = 9

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