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it is -1 and i have to type 20 characters to answer lol

x = -1 (:

You should do this on your own but if you consider the way I graph it, the slope should be going downwards and in the middle of the graph, the y-intercept should be two units down.  Each unit for the x line should be 14 units apart as stated in the function.

Step-by-step explanation:

Hopefully this helps ^^