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(a) (5-k) packets of seaweed left

(b) 5-k+2k = (5+k) packets of seaweed

(b) 5-k+2k = (5+k) packets of seaweed

wait i dont understand how does 5-k+2k give u (5+k) ?

k is a variable that can represent any number. k can be 1, 2, 3...

In this mathematical expression, 5-k+2k, you cannot add or subtract 5 from the terms with k because you don't know what k represents.

But for the 2 terms with k, you can add/subtract them.

It may be difficult to grasp the concept when you are first learning algebra but after some practice, you should be able to get it.

Just to add, 2k means (2×k).

ohh now i understand ty