2. Rewrite the expression by collecting like terms. 1/4n + 1/3b + 1/2b - 4/6a = [! (6.5 points)
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in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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