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r in (-oo:+oo)
2*((3/4)*r-1)+(1/2)*r = (1/4)*r+6 // - (1/4)*r+6
2*((3/4)*r-1)+(1/2)*r-((1/4)*r)-6 = 0
2*((3/4)*r-1)+(1/2)*r+(-1/4)*r-6 = 0
2*(3/4*r-1)+r/2-r/4-6 = 0
(4*2^2*(3/4*r-1))/(2*4)+(4*r)/(2*4)+(2*(-r))/(2*4)+(-6*2*4)/(2*4) = 0
4*2^2*(3/4*r-1)+4*r+2*(-r)-6*2*4 = 0
16*r-2*r-48-16 = 0
14*r-48-16 = 0
14*r-64 = 0
(14*r-64)/(2*4) = 0
(14*r-64)/(2*4) = 0 // * 2*4
14*r-64 = 0
14*r-64 = 0 // + 64
14*r = 64 // : 14
r = 64/14
r = 32/7
r = 32/7
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