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r in (-oo:+oo)
(7*(2*r-3))/3 = 7*r-(3/4) // - 7*r-(3/4)
(7*(2*r-3))/3-(7*r)+3/4 = 0
(7*(2*r-3))/3-7*r+3/4 = 0
(4*7*(2*r-3))/(3*4)+(-7*3*4*r)/(3*4)+(3^2)/(3*4) = 0
4*7*(2*r-3)-7*3*4*r+9 = 0
9-28*r-84 = 0
-28*r-75 = 0
(-28*r-75)/(3*4) = 0
(-28*r-75)/(3*4) = 0 // * 3*4
-28*r-75 = 0
-28*r-75 = 0 // + 75
-28*r = 75 // : -28
r = 75/(-28)
r = -75/28
r = -75/28
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