4r-r/4=15

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Solution for 4r-r/4=15 equation: 


r in (-oo:+oo)

4*r-(r/4) = 15 // - 15

4*r-(r/4)-15 = 0

15/4*r-15 = 0 // + 15

15/4*r = 15 // : 15/4

r = 15/15/4

r = 4

r = 4

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