4r=21/2

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Solution for 4r=21/2 equation: 


r in (-oo:+oo)

4*r = 21/2 // - 21/2

4*r-(21/2) = 0

4*r-21/2 = 0

4*r-21/2 = 0 // + 21/2

4*r = 21/2 // : 4

r = 21/2/4

r = 21/8

r = 21/8

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