Let's make it more complicated.
The lowest x value where f(x) = 1 is your answer.
f(x) = (((-((x)(x-(((7*(10^0)-2+5)*7)/10+2-5+3)-1)(x-(((7*(10^0)-2+5)*7)/10+2-5+3)))/((((x)(x-(((7*(10^0)-2+5)*7)/10+2-5+3)-1)(x-(((7*(10^0)-2+5)*7)/10+2-5+3))))^2)^0.5))+1)/2
Or maybe it isn't