Let y =be new variable. Then the given equation takes the form y^2 + y = 11112222. Simplify and find y y^2 + y - 11112222 = 0. Use the quadratic formula y = = . Since y = is positive, we accept the positive root x = = 3333 and discard the negative root. So, = 3333; hence, 2x = 1 and x= 1/2 = 0.5. ANSWER. x = 1/2 = 0.5.