What is the sum of all possible values of x such that 2x(x - 10) - x(x - 5) = -50?
2x(x - 10) - x(x - 5) = -50
2x^2 - 20x - x^2 + 5x + 50 = 0
x^2 -15x + 50 = 0
(x-10)(x-5) = 0 x = 10 and 5 sum = 15
+37159 
