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ok, well you can brute force this

so there are a total of six possibilities and we can actually list them all:

hmmm actually ok misread, there is an x variable haha

ok so let's list the six possibilities anyway and see where that gets us

1. 2x + 3 = 5
2. 2x + 5 = 3
3. 3x + 5 = 2
4. 3x + 2 = 5
5. 5x + 3 = 2
6. 5x + 2 = 3

k. im with you so far

ok cool, so now let's solve the cases

1. 2x = 2. x = 1 (not negative)

2. 2x = -2. x = -1 (negative)

3. 3x = -3. x = -1. (negative)

4. 3x = 3. x = 1. (positive)

5. 5x = -1. x = -1/5. (negative)

6. 5x = 1. x = 1/5 (positive)

so out of the six possibilities, 3 are positive, 3 are negative

so thats a 50 percent probabilty

exactly

and sometimes there's no systematic theorem or rule - it's just #outcomes/#possible outcomes

right.