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Answer:
-3st²
Step-by-step explanation:
(4s²t-4st²) - (6s²t+6s²t²) - (6s²t² +3st²) + (2s²t-2st²)
4s²t-4st² - 6s²t+6s²t² - 6s²t² +3st²+ 2s²t-2st²
4s²t-6s²t+2s²t - 4st²+3st²-2st² + 6s²t²-6s²t²
0-3st²+0
-3st²
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