Question 846059
{{{-4x(2x+5)+x+7=3x(x+3)}}}
{{{-8x^2-20x+x+7=3x^2+9x}}}
{{{-11x^2-28x+7=0}}}
Use the quadratic formula,
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-(-28) +- sqrt( (-28)^2-4*(-11)*(7) ))/(2*(-11)) }}}
 
{{{x = (28 +- sqrt( 784+308) )/(-22) }}}
{{{x = (28 +- sqrt( 1092) )/(-22) }}}
{{{x = (28 +- 2*sqrt( 273) )/(-22) }}}
{{{x = (14 +- sqrt( 273) )/(-11) }}}