Question

Twice the sum of a number and 10 is -20

Answer 1

2(n + 10) = -20.....ur equation
n + 10 = -20/2
n + 10 = -10
n = -10 - 10
n = -20....ur number

Answer 2

Let, the number = x

Then, 2(x + 10) = -20

2x + 20 = -20

2x = -20 - 20

x = -40/2

x = -20

In short, The number would be: -20

Hope this helps!