r/3=21

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Solution for r/3=21 equation: 


r in (-oo:+oo)

r/3 = 21 // - 21

r/3-21 = 0

1/3*r-21 = 0 // + 21

1/3*r = 21 // : 1/3

r = 21/1/3

r = 63

r = 63

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