Unknowns
When Letters and Numbers meet
Letters and numbers all at the same time may seem terrifying, but trust me, it's better this way.
For instance:
Solve: half of three times a number. The sum of this value and the same number added to six is equal to the first number minus four times the second.
This is how algebra was done in the ancient times, in fact our way of using symbols, letters, and numbers is relatively new, only around 700 years old.
So, would you rather solve the above problem by reading it, or solving this: