Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

John was piloting a plane behind a car but was never able to overtake it. Why?

The Judge knows that Alamgir was killed by his girlfriend Jasline, but the judge is unsure whether to punish her. Why?

Can you find the largest Three-digit number whose sum is 14 and whose square is less than 5,00,000?

How can you tell a raw egg from a hard-boiled egg?

What jumps when it walks and sits when it stands?

How many times in a given day, minutes and hour clock comes in a straight line ?

What does below chemistry rebus means?