book Maths Puzzle Numerical Ability

Solve x+3=|2x|by graphing f(x)= x+3 and g(x)= |2x|.

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book Other Question

5/x+4=4+3/x-2 my question says:
solve 6m-5n=-14 for m
i solved this and got m=5n-14 over 6 i'm not sure if this is right, and also what do you do with the 6 if this is right?
thanks for yo