r/3=7

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Solution for r/3=7 equation: 


r in (-oo:+oo)

r/3 = 7 // - 7

r/3-7 = 0

1/3*r-7 = 0 // + 7

1/3*r = 7 // : 1/3

r = 7/1/3

r = 21

r = 21

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