book Maths Puzzle Numerical Ability

3x+1=16 (The answers are... 3,4,5, or none of these)thank you very much

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book Other Question

what is the answer to this question:-2+8=-5x+7+4 This question is from Chemistry class "Chemical Equilibrium" -I just cannot figure it out, I've been trying for the last 3 hours to solve it. I will give you the answere as copied