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Add the following polynomial
1.6x + 4x =
2.-7ab + 10ab =
3.{3y + 5} + {5y - 3} =
4.{8x2 - 2x + 4} + {x2 + 5x - 1} =
5.{5m + 8n} + {2m - 3n} + {-4m + 7n} =