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enter image description here

What is the missing number in the picture above?(question is from some puzzle game) I tried some approaches, but haven't found any meaningful rule..thanks in advance!

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  • $\begingroup$ Welcome to Puzzling! What puzzle game is this from? If a question is taken from somewhere else, you need to specify where exactly it's from. $\endgroup$ – Deusovi Jun 30 '19 at 0:50
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It can be assumed that evaluation is left to right (or rather: clockwise), not by precedence rules. Then this reads

$$\frac{\frac{(x-9)\cdot 5}2-4+12}3+7=x$$

and simplifies to

$$\frac56x+\frac{13}6=x $$

or

$$ x=13.$$

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