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A. Fill in the blank to make the statement correct.
1) 6 + 7 =
2) 6b + 7b = __b
3) 5ab2 + 4ab2 + 13ab2 =
ab2
4)(5x + 4y) + (-3x + 7y) = 2x + y
5) (3x2 + 8x - 10) + (8x2 -2x + 3) = 11x2 + x - 7​