What it looks like
u + t = v
Free u.
Every letter is a hidden number. The rule is the same. Do the same to both sides until your letter is on its own.
In the game you pick a letter to cast with, not a number.
Worked example 1
u + t = v
Subtract t from both sides
u = v − t
The answer is not a number. It is letters. That is what a finished formula looks like.
You have not gone wrong.
Worked example 2
Free l.
2l + 2w = P
Subtract 2w from both sides
2l = P − 2w
Divide both sides by 2
l = (P − 2w) ÷ 2
The brackets show that the whole side is divided by 2.
The most common mistake
Dividing only part of a side.
Not this
2l = P − 2w, divide by 2
l = P − 2w ÷ 2
Only the 2w was divided.
This
2l = P − 2w, divide by 2
l = (P − 2w) ÷ 2
Everything was divided.
In the game
You meet these puzzles in the Sky Observatory.