7=r/3

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Solution for 7=r/3 equation: 


r in (-oo:+oo)

7 = r/3 // - r/3

7-(r/3) = 0

7-1/3*r = 0 // - 7

-1/3*r = -7 // : -1/3

r = -7/(-1/3)

r = 21

r = 21

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