If 21x = 79x, what is the value of x?

Sherlock breaks into a crime scene. The victim is the owner who is slumped dead on a chair and have a bullet hole in his head. A gun lies on the floor and a cassette recorder is found on the table. On pressing the play button, Sherlock hears the message 'I have committed sins in my life and now I offer my soul to the great Lord' and followed a gunshot Sherlock smiles and informed the police that's its a murder.

Why did he think so?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Can you move 2 matchsticks to form four equal sized squares.

What question can you never answer yes to?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

What came first, the chicken or the egg?

What does it mean?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=