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r in (-oo:+oo)
2*((3/4)*r-1)+1/2 = (1/4)*r+6 // - (1/4)*r+6
2*((3/4)*r-1)-((1/4)*r)+1/2-6 = 0
2*((3/4)*r-1)+(-1/4)*r+1/2-6 = 0
2*(3/4*r-1)-r/4+1/2-6 = 0
(4*2^2*(3/4*r-1))/(2*4)+(2*(-r))/(2*4)+(1*4)/(2*4)+(-6*2*4)/(2*4) = 0
4*2^2*(3/4*r-1)+2*(-r)+1*4-6*2*4 = 0
10*r-48-16+4 = 0
10*r-48-12 = 0
10*r-60 = 0
(10*r-60)/(2*4) = 0
(10*r-60)/(2*4) = 0 // * 2*4
10*r-60 = 0
10*r-60 = 0 // + 60
10*r = 60 // : 10
r = 60/10
r = 6
r = 6
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