Let's say your son has -1$. Imagine it as he owning that dollar to you. If you multiply that debt by 2, the debt is now 2 dollars. If you multiply it by zero, the debt is now cancelled. If you multiply it by -2 the debt turns to credit and now he has 2 dollars.
Dreamwalk3r t1_jedzapo wrote
Reply to ELI5 Why does a Minus Negative turn into a Plus? by doggie_doggie
Let's say your son has -1$. Imagine it as he owning that dollar to you. If you multiply that debt by 2, the debt is now 2 dollars. If you multiply it by zero, the debt is now cancelled. If you multiply it by -2 the debt turns to credit and now he has 2 dollars.