Answer:
To solve this expression, we can use the order of operations, which tells us to perform the operations inside the parentheses first, and then multiply by -2.
So, we have:
(12 + 13) (-2)
= (25) (-2) // simplify the parentheses by adding 12 and 13
= -50 // multiply 25 by -2
Therefore, (12+13)(-2) equals -50.