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

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

When it is alive we sing, when it is dead we clap our hands. What is it?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

There are nine dots in the picture that has been attached with this question. Can you join all the dots by drawing four straight lines without picking up your pen?

Can you count the number of blocks in the picture below?

Can you find the thief by just looking at the picture below?