exam Maths Puzzle Numerical Ability

Please help me solve this equation: f(x,y)= 4+ x-2y over 2
y

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exam Other Question

7. log2(x - 2) + 5 = 8 - log2 4

I am not sure how to write this problem; I need help with the steps to figure the answer out. x 3/2power = 125

I do not understand how to start this. I appreciate any assistance, thank you.