The sum of two consecutive numbers is -21. What are the two numbers?

**x = first consecutive number**

x + 1 = second consecutive number

x + 1 = second consecutive number

x + x + 1 = -21 {sum of the two numbers is -21}

2x + 1 = -21 {combined like terms}

2x = -22 {subtracted 1 from each side}

x = -11 {divided each side by 2}

x + 1 = -10 {substituted -11, in for x, into x + 1}

**-11 and -10 are the two consecutive numbers**

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