rsx^2 + s^2 x + rtx + st = 0
Now just use the quadratic formula: x = [-(rt+s^2)±√((rt+s^2)^2 - 4rs^2t)]/2rs = [-(rt+s^2)±(rt-s^2))]/2rs = (-rt-s^2+rt-s^2)/2rs = -s/r or = (-rt-s^2-rt+s^2)/2rs = -t/s
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