2х+18 разделить на х-3 равно 12

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To divide 2x+18 by x-3, we can use long division method:

```
2
___________
x - 3 | 2x + 18
2x - 6
-------
24
```

Therefore, (2x+18)/(x-3) = 2 + 24/(x-3)

To find the root of the equation 2 + 24/(x-3) = 12, we can first subtract 2 from both sides:

24/(x-3) = 10

Then multiply both sides by (x-3):

24 = 10(x-3)

Simplifying:

24 = 10x - 30

54 = 10x

x = 5.4

Therefore, the root of the equation is x = 5.4.