if -9 is added to a number and the sum is doubled, the result is 11 less than the number. Find the number
2 answers:
Suppose that x is the number we want :
- 9 added to it means :

And sum is doubled means :

The result is 11 less than the number which means :

Now let's find the x ...

Add both sides 18


Subtract both sides x



Thus that number is <em>7</em>
<u>Answer: 7</u>
let x be the number
2(-9 + x) = x - 11
-18 + 2x = x - 11
2x - x = -11 + 18
x = 7
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