Math Cross: Plus–Minus

How to play?

Welcome to Math Cross!
In each round, a target number is shown. Use the current operation (＋ or −): find two adjacent cells whose result equals the target, then drag one onto the other to remove both.
You may move only up, down, left, or right—sliding through empty spaces is allowed, but you can’t pass through tiles or move diagonally.
A wrong drop costs one star.
Tip: Accuracy matters more than speed. Good luck!