an expressions with multiple terms: 17a + 14b, 3x + 4, 17y - 12, a2 - 3a + 1, 12a2 + 4ab - 3b2, a term: 3a, 7b2, 12xy2, 14c, an equation: x + 3 = 10, 3 - 2x = 7 + x, a + 3b = 12, 3x + 1 = x ÷ 2, y = 3x - 2, an operator: +, -, ÷, ×, none of the above: x < 10, (2, 4), x = 3 and y = 9, 0 ≤ x ≤ 12,

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