11/4r-9=4/7r

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Solution for 11/4r-9=4/7r equation: 


r in (-oo:+oo)

(11/4)*r-9 = (4/7)*r // - (4/7)*r

(11/4)*r-((4/7)*r)-9 = 0

(11/4)*r+(-4/7)*r-9 = 0

61/28*r-9 = 0 // + 9

61/28*r = 9 // : 61/28

r = 9/61/28

r = 252/61

r = 252/61

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