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20 February, 08:22

Write the expression in standard form by expanding and combining like terms.

9 (r - s) + 5 (2r - 2s)

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  1. 20 February, 09:19
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    Multiply out as indicated: 9 (r - s) + 5 (2r - 2s) = 9r - 9s + 10r - 10s. Next, combine like terms, obtaining 19r - 19s (answer)
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