Question 159668
-6r - 10s + 8r + 4s - 6 
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Begin by grouping like-terms together thus:
(-6r + 8r) + (-10s + 4s) - 6
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Now combine the terms inside each parentheses:
(2r) + (-6s) - 6
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Removing the parentheses:
2r - 6s - 6
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Now, looking at each of the terms above, they have a common factor of 2 -- pull it out:
2(r - 3s - 3)
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That's it, you're done.