3+r/3=21

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Solution for 3+r/3=21 equation: 


r in (-oo:+oo)

r/3+3 = 21 // - 21

r/3-21+3 = 0

1/3*r-18 = 0 // + 18

1/3*r = 18 // : 1/3

r = 18/1/3

r = 54

r = 54

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