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2. 10u^2-3u-15+5u^2-5u+15 = 15u^2-8u
3. 12y^2-7y-8-6y^2-3y+1 = 6y^2-10y-7
4. 12a^2+13ab-3b^2
5. -16x^6y^4-10x^4y^4-6x^2y^4