21 and it always will be.

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No 17 is the answer.

Ah, I thought it was parentheses first, then left to right. So it's all the multiplication first, then the addition. Been a long time.

GEMS or PEMDAS.

8-5 is 3 we do that first it leaves this

2+5*3=

Once we get there multiply/divide before add subtract

So then we end up with

2+15= 17