r/3-21=12

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Solution for r/3-21=12 equation: 


r in (-oo:+oo)

r/3-21 = 12 // - 12

r/3-21-12 = 0

1/3*r-33 = 0 // + 33

1/3*r = 33 // : 1/3

r = 33/1/3

r = 99

r = 99

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