Tobin is solving the equation 3 (x - 1.25) = 11.25. His work is shown below.

3 (x - 1.25) = 11.25

3x - 3.75 = 11.25

3x - 3.75 + 3.75 = 11.25 + 3.75

3x = 15

3x • 3 = 45.3

x = 135

What mistake did Tobin make?

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