Answer:
-3
Explanation:
First, you need to put it in slope intercept form, which is y=2x+6. To find the x int., plug in y for 0. Get x by itself to get -6=2x. Then solve for x to get -3.
TL;DR
-y=-2x-6
y=2x+6
0=2x+6
-6=2x
-3=x
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