Twenty less than ten times a certain number is 600. Find the number.

Let x represent the unknown number. Set up an equation.
10x −20 = 600
Solve the equation. Add 20 to both sides, then divide the resulting equation by 10.
10x −20 = 600
10x − 20 + 20 = −600 + 20
10x = 620
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X=62