What, in your own words, have you been asked to assign to remainder?
The equal sign (=), when there’s only one, assigns the value on the right out the equals to the thing on the left.
So remainder = 11 would work fine, as would remainder = 11 % 3. But javascript sees the statement you have, and reads it a you trying to set the value 2 (to the right of that second equal) into… 3 (the thing to it’s immediate left).
Does 3 equal 2? 3 isn’t a valid variable, it’s a number… So javascript errors out.
This symbol = is the assignment operator. It puts the value on the right into the variable on the left. You have two of them. The second one doesn’t make any sense.