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Operations on Algebraic Expressions

Question

Fill in the blanks:
$$12 - 9 + 15 = $$ and $$12\,ab - 9\,ab + 15\,ba = $$.

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Solution

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$$12 - 9 + 15 = 18$$ and $$12\,ab - 9\,ab + 15\,ba = 18\,ab$$

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