What was the "real" first equation?

Question

The first equation ever written, using a modern equals sign, has TWO versions:

Version 1:

Wiki link and Another link gives

$$ 14x+15=71 $$

But from a UK maths textbook, it gives

$$ 14\sqrt{x}+15=71 $$

So which one is the correct interpretation of the picture:

Answer 1

Here is an online translation of the original text,

Clearly the answer is 4 (as shown in the last phrase), so the equation must be 14x + 15 = 71 and not $14 \sqrt{x} + 15 = 71$.