r/4+8=13

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Solution for r/4+8=13 equation: 


r in (-oo:+oo)

r/4+8 = 13 // - 13

r/4-13+8 = 0

1/4*r-5 = 0 // + 5

1/4*r = 5 // : 1/4

r = 5/1/4

r = 20

r = 20

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