exam Maths Puzzle Numerical Ability

I am not able to figure these out. Can someone help me through a couple

1.) log4x+log4y-log4m

2.) ln54-ln6

3.) log(x-2)-log(x-2

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exam Other Question

4-3x=16 is the answer 4

dont get this one -13(3x-11)+2=28

6-4(2-1/2x)+x=22

help me please Hello, can anyone help me with this?

Solve the following system by graphing.

x + y = 6
x - y = 3