r/7/3=9

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Solution for r/7/3=9 equation: 


r in (-oo:+oo)

(r/7)/3 = 9 // - 9

(r/7)/3-9 = 0

1/21*r-9 = 0 // + 9

1/21*r = 9 // : 1/21

r = 9/1/21

r = 189

r = 189

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