Who is right and wrong and why?

BMX Ben is correct and Pizza Pete is wrong

Step-by-step explanation:

For Both equations, we must isolate the x, or move everything to one side. So you'd have to add 25 because you have a negative 25 and a negative number plus a positive version of itself equals 0

x-25=7

+25=25

x=32

The second one is incorrect because you are subtracting negative 25 from a 25, which is -50