book Maths Puzzle Numerical Ability

my question is:
solve 6m-5n=-14 for m
thanks

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book Other Question

Find all real or imaginary solutions for this equation.

49^2+ 9 = 42x

I can not not figure this one out. I thought it was something like:

-49^2sqrt 49^2+3(3)=42

Any assistance would be greatly appreciated Hi will you please explain to me how to determine whether each relation is linear. Here is one problem:

y=-4