4/5=r/2

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Solution for 4/5=r/2 equation: 


r in (-oo:+oo)

4/5 = r/2 // - r/2

4/5-(r/2) = 0

4/5-1/2*r = 0 // - 4/5

-1/2*r = -4/5 // : -1/2

r = -4/5/(-1/2)

r = 8/5

r = 8/5

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