exam Maths Puzzle Numerical Ability

how do i solve this? a+1 over 2 = 1 over a? Please Help fast as you can!

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exam Other Question

please help me understand:

explain how to apply substitution in solving a system of equations.

Thank you. Can someone help me solve this problem?

I need to solve: 4(x + 2) - 3x + x - 6

Thank you,
Lyn