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r in (-oo:+oo)
(6*r-7)/10 = r/4 // - r/4
(6*r-7)/10-(r/4) = 0
(6*r-7)/10-r/4 = 0
(4*(6*r-7))/(4*10)+(10*(-r))/(4*10) = 0
4*(6*r-7)+10*(-r) = 0
14*r-28 = 0
(14*r-28)/(4*10) = 0
(14*r-28)/(4*10) = 0 // * 4*10
14*r-28 = 0
14*r-28 = 0 // + 28
14*r = 28 // : 14
r = 28/14
r = 2
r = 2
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