book Maths Puzzle Numerical Ability

what is the anwser to this equation ?

3x-2=-5

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book Other Question

F(4)=450log3(5t+7) please solve help class in 3 hours cant solve I have no clue how to do this problem, so can you do it and then i can see how you got the answer? x2-y2/(x-y)2 x 1/x+y