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Answer:
-x-1=6
-x=6+1
-x=7
x=-7
Explanation:
We're given the function f(x) = -x - 1, and asked to solve for x when f(x) = 6.
So what I do is I substitute 6 for f(x):
6 = -x - 1
And now, I have an equation with one unknown.
-x - 1 = 6
-x = 6 + 1
-x = 7
x = -7
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