Answer:
40
~
Puedes resolverlo simplificando la ecuación.
You can solve it by simplifying the equation.
50 - 8 - 30 + 28 =
(50 + 28) - (8 + 30) =
78 - 38 =
Its much easier to solve 78 - 38 than 50 - 8 - 30 + 28, which is why you simplify the question before calkylating it.
sorry i dont know Spanish...
but hope i could help :D
