Hi Eliana,
The answer is 2x+y=-5 which is the standard form, same equation as y=-2x-5 (slope intercept form). It's just rearranged to get the standard form.
When you add 2x to both sides, you get
2x + y = 2x-2x -5 (I just put the 2x you add to both sides in front of each side)
the 2x-2x winds up canceling out, leaving just
2x + y = -5
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