exam Maths Puzzle Numerical Ability

Please explain.

-4(2x-3)=8x+5

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exam Other Question

The selling price for one computer keyboard is $17.00. The total cost (in dollars) to produce x keyboards is given by C(x)=6x+40. Assuming the keyboard manufacturer can sell all un Simplify the given expression by using properties of exponents. Write your final answer with only positive exponents.

[(5x^-1 z^7)^-4]^-9