Question 331189
{{{4x(x-5)-5x(x-4)=-1}}}
{{{4x^2 - 20x -5x^2 + 20x = -1}}}
{{{-x^2 = -1}}}
{{{x^2 = 1}}}
x=1 and x= -1
Check your answers by pluggin in those 2 values for x, one at a time, and verifying the equality is 'true'