exam Maths Puzzle Numerical Ability

I dont understand how you are supposed to justify each step because it just doesnt make sense to me...

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exam Other Question

please help me in giving me steps to solve systems equations with real world problem
example
The sum of two numbers is 25.One number is twice the second plus seven. what are the Hello, can someone help me solve this inequality PLEASE???
-15/17 < - 10/17x
Thank You for taking the time to help.