9=r/4

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Solution for 9=r/4 equation: 


r in (-oo:+oo)

9 = r/4 // - r/4

9-(r/4) = 0

9-1/4*r = 0 // - 9

-1/4*r = -9 // : -1/4

r = -9/(-1/4)

r = 36

r = 36

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