what is the addition related sentence of 25-12=13

looks like the evil orginization is behind this

prepare....for anything

*grabs desert eagle, begins problem

so 25-12=13

addition-related, hmm, you prehaps looking for this equation:

$${\mathtt{13}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}} = {\mathtt{25}}$$ ?

that perhaps is what youre looking for

I am not entirely sure what you are asking for, but I tried to kind of solve these for you.

1. Equal or 25=25

2. Equal or 18=18

3. -17<10