Doh! Somebody has messed up with their Roman numeral matchstick equations. As you do.
Try to correct a mistake by moving a single matchstick, to get the correct equation each time.
The following equation is made of 11 matches:
XI - V = IV
The following equation is made of 11 matches:
X + V = IV
The following equation is made of 10 matches:
L + L = L