[(5т18кг - 8ц25кг) * 2] + 4ц3кг

First, convert tons to centners:
5 tons = 500 centners
8 centners + 25 kilograms = 825 centners

Now, perform the calculation:
(500 centners - 825 centners) 2 = (-325) 2 = -650 centners
-650 centners + 4 centners + 3 kilograms = -646 centners + 3 kilograms = -645 centners + 95 kilograms

So, the result is -645 centners and 95 kilograms.