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–(t3 – 4t2 + 2t) + (3t – 5t2 + t3) =
(a2 – 3a) – (5a2 – 6a + 2) + (4a2 – 3) =
–(5s – 6t) + (4t – 3s) – (10t – 2s) =
4v2u + (3u2v – 2uv2) – (5uv2 + u2v) =
3(x – 2y) + 2(y – 3x) – 4(x – y) =
a(a – b) – b(a + b) + a(2b – a) =
(c + d)(c – 3d) – (c3d – 3cd3) : (cd) =
(u – v)2 – (u + v)2 =
(m + 3n)(m – 3n) – (m + n)(m – 9n) =