exam Maths Puzzle Numerical Ability

3x - 5(3x -7) =2(x +9) +45

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I cant figure out how to solve ...
(x+4)/3x + (x+8)/5x = 2 This questions gives me the jitters...

Solve using logs:2^2x+4 minus 2^2x =120

I know the answer but not the steps:(