if the average ( arithmetic mean ) of x + 3 , x + 4 , and x + 5 is 0 , then x =
"( x + 3 + x + 4 + x + 5 ) / 3 = 0 = > 3 x + 12 = 0 = > x = - 4 answer a"
subtract(multiply(4, const_2), multiply(3, const_2))