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3x + 1 = 511

Subtract 1 from both sides:

3x = 510

Divide both sides by 3:

x = 170

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Subtract 1 from both sides

3x = 511 - 1

Simplify 511 - 1 to 510

3x = 510

Divide both sides by 3

x = 510/3

Simplify 510/3 to 170

x = 170