book Maths Puzzle Numerical Ability

write an algebraic equation for the english statement "substract 5 from the sum of x and 7 time 3 and the result is 20.

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book Other Question

Solve all real and imaginary solutions: 1/X + 1(X-1) = 1/4 My daughter says that her teacher did not explain how to convert unit multipliers.? I am not sure what she is asking. Can you help us please.
Thank you.