Answer
-4
Work Step by Step
"Double the sum of a number and 6" translates to 2(x + 6).
"the opposite of the number" translates to -x.
Therefore, the equation is 2(x + 6) = -x
Solve for x:
2x + 12 = -x
3x + 12 = 0
3x = -12
x = -4
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