The sum of 12 and 11 times a number is -318

​The sum of 12 and 11 times and a number is -318. What is the number?

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x = the number {the unknown}

11x + 12 = -318 {the sum of 12 and eleven times a number is -318}
11x = -330 {subtracted 12 from each side}
x = -30 {divided each side by 11}

the number is -30

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