exam Maths Puzzle Numerical Ability

May I have some help with equation: m/-1 = 50

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exam Other Question

3/2x - 14 = 16 how do you find where two lines cross with out graphing them; for example: y = 2x + 4 and y = .5x - 2. I tried setting the equations the same and solving, but it did not turn out the same as when i graphed them.