2.12=r/9

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Solution for 2.12=r/9 equation: 


r in (-oo:+oo)

2.12 = r/9 // - r/9

2.12-(r/9) = 0

2.12-1/9*r = 0 // - 2.12

-1/9*r = -2.12 // : -1/9

r = -2.12/(-1/9)

r = 19.08000019

r = 19.08000019

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