double post (to be deleted)
reference: http://web2.0calc.com/questions/what-is-the-value-of-x-in-the-equation-9-x-3-4-3-10
double post (to be deleted)
reference: http://web2.0calc.com/questions/what-is-the-value-of-x-in-the-equation-9-x-3-4-3-10