Trick question I don’t understand

[pseudo kettle]

I’m losing my braincells reading this

[paper crater]

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[bitter forge]

y = +- 10

The question intends for a=10-7=3 and b=-10-4=-14

3 + -14= -11

[pseudo kettle]

But why negative

[bitter forge]

What is (-10)(-10)

[pseudo kettle]

100

Oh

+close