book Maths Puzzle Numerical Ability

3-x/8=-2 Can somone help me with this?

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The cost to run Machine 1 for an hour is $2. During that hour, Machine 1 produces 240 bolts and 100 nuts. The cost to run machine 2 for an hour is $2.40. Durin that hour, Machine 2 hi need help w/the following
simplify the following expression
x^-1 - y^-1 /x^-1 + y^-1