What is a sum in math? In math, a sum is the result of an addition. For example, in 16 + 4 = 20, 20 is the sum.
1. In 5 + 4 = 9, 9 is the sum
2. In 10 + 10 = 20, 20 is the sum
3. In -5 + 4 = -1, -1 is the sum
4. In 6x + 5y + -2x + y + z = 4x + 6y + z, 4x + 6y + z is the sum
5. In 3x^{2} + 2x^{2} = 5x^{2}, 5x^{2} is the sum
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