book Maths Puzzle Numerical Ability

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

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book Other Question

find the actual width of the doorway into the kitchen and the dining room if the scale is 2:24 and on the drawing the doorway is 1/4 of an inch. Hii i need help on this problem. And the question says write each expression as a simple fraction... -5 to the -3 power