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12x is only one term

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The top left doesn´t belong because its the only equation with a subtraction symbol

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i think bottom left because the first term doesnt have a x value and the rest do on their first term

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The top right does not belong because it is a monomial.

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The one in the right bottom, because it has 3 terms.

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x^2+5x+6 because the equation has a power of 2 and is has 3 terms instead of 2.

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The top left

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Bottom left doesnt belong there because its out of order.

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the bottom right because it's a trinomial and the leading coefficient has the power of two.

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I feel like the bottom right doesn't belong there because it's the only one with it's leading coefficient being x^2. it is also the only one being a quadratic trinomial

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12x is a constant

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the bottom right. because it has 2 variable

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The bottom right because it has 3 terms.