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

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Can you identify the Oscar-winning movie from the rebus below?

John buys rice at Rs.60/kg from Britain and then sells them at Rs.5/kg in India. As a result of this, he becomes a millionaire. How come?

Can you find the company name in the pictogram below?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

What does the below mathematical rebus mean?

What does man love more than life, hate more than death or mortal strife; That which contented men desire; the poor have, the rich require; the miser spends, the spendthrift saves, and all men carry to their graves?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.