A good education system is said to be progressive only if it respects both the genders and giving the same education under a single roof.
Co-education institutions help in laying the foundation for both the genders to learn how to co-exist with respect and dignity.This maintains co existence and tolerance towards each other.
Your answer to this question is going to be x= -3. You solve this by moving x to one side of the equation and solving. Hope I helped!