exam Maths Puzzle Numerical Ability

I'm just beginning to do proofs. How do I even begin? Please explain a systematic method to set up a proof.

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exam Other Question

please help me solve x(x+5)=0 thank you so much Solve and check each of the following equations for x. This is easy and i think I am thinking to hard. Please help.
x/6 - x/8 = 1