r/4+5=9

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Solution for r/4+5=9 equation: 


r in (-oo:+oo)

r/4+5 = 9 // - 9

r/4-9+5 = 0

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

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

r = 4/1/4

r = 16

r = 16

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