exam Maths Puzzle Numerical Ability

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

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This is a travel problem to me. So I picked this area. A train goes one way to twenty stations and at each station, picks up a group of people, one of which will get off at each Please help me solve this equation: f(x,y)= 4+ x-2y over 2
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