What is negative 4x plus 5 equals negative 15

-4x + 5 = -15
-4x = -15 - 5
-4x = -20
x = -20/-4
x = 5 <==

-4x + 5 = -15

-4x  = -15 - 5    (when you bring a number over, flip the sign)

-4x = -20  ( simplify to one term)

-4x/-4 = -20/-4 ( what you do to one side, you do to the other)

x = 5 ( answer)

hope this helps

If your asking how much altogether for 12 performance the answer will be 98,496.