3x - 15 = 6 × 2
3x - 15 = 12
3x = 15 + 12
3x = 27 ÷ 3
x = 9
El numero es 9.
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3x - 15 = 6 × 2
3x - 15 = 12
3x = 15 + 12
3x = 27 ÷ 3
x = 9
El numero es 9.