(9r-18)/2=45

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Solution for (9r-18)/2=45 equation: 


r in (-oo:+oo)

(9*r-18)/2 = 45 // - 45

(9*r-18)/2-45 = 0

(9*r-18)/2+(-45*2)/2 = 0

9*r-45*2-18 = 0

9*r-108 = 0

(9*r-108)/2 = 0

(9*r-108)/2 = 0 // * 2

9*r-108 = 0

9*r-108 = 0 // + 108

9*r = 108 // : 9

r = 108/9

r = 12

r = 12

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