(81-х)÷5=12

Ответ: 81-х, деленное на 5, равно 12.

To solve the equation, we can first isolate "х" by multiplying both sides of the equation by 5:

5 * (81 - х) ÷ 5 = 12 * 5

81 - х = 60

Next, we can isolate "х" by subtracting 81 from both sides:

-х = 60 - 81

Simplifying further:

-х = -21

Finally, we can solve for "х" by multiplying both sides of the equation by -1:

х = -(-21)

So the value of "х" is 21.