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r in (-oo:+oo)
4*r = 6*(6/7) // - 6*(6/7)
4*r-(6*(6/7)) = 0
4*r-36/7 = 0
4*r-36/7 = 0 // + 36/7
4*r = 36/7 // : 4
r = 36/7/4
r = 9/7
r = 9/7
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