exam Maths Puzzle Numerical Ability

Use substitution to solve: 2x+y=7,5x-2y=4

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exam Other Question

What is the difference in parentheses versus brackets and when do you use each with regards to interval notation? Simplify:

3
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4
_______
4
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5

I do not understand how to complete thsi problem, can anyone help me out? Thank you so much:-)