book Maths Puzzle Numerical Ability

I am having trouble solving this problem. Any help will be greatly appreicated.

square root symbol x-7 - square root symbol x = -1

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book Other Question

four oranges and five apples cost $3.56 three oranges and four apples cost $2.76. find the cost of an orange and the cost of an apple. what's an integer for the expression -(17)?