[input]4=(5x-5)/(7x)-(6x^2-50x+16)/(7x)[/input]
4=((5x-5)-(6x^2-50x+16))/(7x)
4=(5x-5-6x^2+50x-16)/(7x)
4=(-6x^2+55x-21)/(7x)
28x=-6x^2+55x-21
28x-55x= -6x^2-21
-27x = -6x^2-21
-6x^2+27x-21=0
-6*(x^2-27x/6+21/6)=0
-6*(x^2-27x/6+21/6) is zero, if (x^2-27x/6+21/6) is zero:
x 1,2 = -p/2 +- sqrt( (p/2)^2 - q )
p = -27/6
q = 21/6
x1 = -(-27/6)/2 + sqrt( ((-27/6)/2)^2 - 21/6 )
[input]-(-27/6)/2 + sqrt( ((-27/6)/2)^2 - 21/6 )[/input]
x1 = 3.5 = 7/2
x2 = -(-27/6)/2 - sqrt( ((-27/6)/2)^2 - 21/6 )
[input]-(-27/6)/2 - sqrt( ((-27/6)/2)^2 - 21/6 )[/input]
x2 = 1
+3146 
