2+?=-1 I don’t know what this is

x=-3

Step-by-step explanation:

lets make the "?" to a "x"

2+x=-1

do the math and its x=-3

so that means 2+-3=-1

? = -3

2 + -3 = -1

Step-by-step explanation:

You're adding negative 3 to positive 2 (2 + -3 = -1), which is the same thing as subtracting positive 3 minus positive 2 (2 - 3 = -1).

Hope this helps :)