1=r/4-4

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Solution for 1=r/4-4 equation: 


r in (-oo:+oo)

1 = r/4-4 // - r/4-4

1-(r/4)+4 = 0

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

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

r = -5/(-1/4)

r = 20

r = 20

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