R/2=21

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Solution for R/2=21 equation: 


R in (-oo:+oo)

R/2 = 21 // - 21

R/2-21 = 0

1/2*R-21 = 0 // + 21

1/2*R = 21 // : 1/2

R = 21/1/2

R = 42

R = 42

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