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Anonymous
7k + 4 + 4k - 9 - 5k
(7k + 4k - 5k) + (4 - 9)
6k + -5
6k - 5
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3k-5=7k+73k-7k=7+5-4k=12k=-3
-6k+7k = 1k or normally k on its own.
The answer is 13k .
3k+4m+2
17k2-4k+19-14k2-16-7k-11k2=-8k2-11k+3