Question 401472
{{{ (2x^2-5)/3=-4 }}} multiply each side by 3
{{{ 2x^2-5 = -12 }}} add 5 to each side

{{{ 2x^2=-7}}} divide each side by 2
{{{x^2=-3.5}}} take square root of each side
{{{x=sqrt(-3.5)}}} if you learned imaginary numbers already then simplified answer would be
{{{x=i*sqrt(3.5)}}}