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27.
3(a-b)(3r-t)+9(b-a)(2t-5s)
=3(a-b)(3r-t)-9(a-b)(2t-5s)
=3(a-b)[(3r-t)-3(2t-5s)]
=3(a-b)(3r-t-6t+15s)
=3(a-b)(3r-7t+15s)
3(a-b)(3r-t)+9(b-a)(2t-5s)
=3(a-b)(3r-t)-9(a-b)(2t-5s)
=3(a-b)[(3r-t)-3(2t-5s)]
=3(a-b)(3r-t-6t+15s)
=3(a-b)(3r-7t+15s)
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3(a-b)(3r-t)-9(a-b)(2t-5s)
=3(a-b)(3r-t-6t+15s)==3(a-b)(-3r-t+15s)
=3(a-b)(3r-t-6t+15s)==3(a-b)(-3r-t+15s)
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