exam Maths Puzzle Numerical Ability

solve for x, (2x+3)/y =5x

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exam Other Question

HOW MANY FOUR DIGIT NUMBERS CAN BE FORMED FROM 1,2,3,4,5,6,7 WHICH IS GREATER THAN 3400? I had a question on a test which was the absolute value (using l in lieu of the absolute value sign) of l3-5xl=-7. The answer is 0. Is this because x cannot be negative?