exam Maths Puzzle Numerical Ability

Solve

5(2x-2)=40

I have no idea how to do this one at all please help.

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exam Other Question

The amount A in an account after t years from an initial principle P invested at an annual rate r compounded continuously is given by A=Pert where r is expressed as a decimal. Solv Find one angle with positive measure and one negative measure coterminal with -310 degrees