book Maths Puzzle Numerical Ability

What is 2(x-3)-5=4(x-5)?
Can you also show the steps.

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I have no idea how to solve this problem

The cooling system on a truck contains 5 gallons of coolant that is 40% antifreeze. How much must be withdrawn and replaced with %100 antifreeze to bring the mixture to 50% antifreeze?
(( the square root of m) + ( the square root of 20)) all is squared or ^2



direction are to simplify