(3r+9)/2=18

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Solution for (3r+9)/2=18 equation: 


r in (-oo:+oo)

(3*r+9)/2 = 18 // - 18

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

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

3*r-18*2+9 = 0

3*r-27 = 0

(3*r-27)/2 = 0

(3*r-27)/2 = 0 // * 2

3*r-27 = 0

3*r-27 = 0 // + 27

3*r = 27 // : 3

r = 27/3

r = 9

r = 9

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