exam Maths Puzzle Numerical Ability

Will someone please help me with this problem?
Five times the difference of a number and eight is negative thirty. Find the number.

Thank You,
Sabrina

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exam Other Question
Write a system of two equations in two unknown for each problem. Solve each system by substitution. Solve for x in the equation x + 1 = the square root of (the total of) x + 3.

Thank you very much.

Sabin