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3y² - 2{y-y[y+4y - 12 ]-5}
3y² - 2{y-y[5y - 12 ]-5}
3y² - 2{y-5y² + 12y - 5}
3y² - 2{-5y² + 13y -5}
3y² +10y² - 26y +10
13y² - 26y + 10