Question 421469
{{{4x^2 - 28x - 5x^2 + 30x = -3}}} 
<==> {{{-x^2 + 2x + 3 = 0}}}
<==> {{{x^2 - 2x - 3 = 0}}}
<==> (x - 3)(x + 1) = 0
==> x = 3, -1.