How do I fix a low area of a concrete slab ?

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Hi, Someone poured a concrete slab 14'x18' and left a really bad low

area against the house from the corner to the sliding glass door. So

now when I rinse it off it floods, and the person that did it won't answer there phone so I'm going to see if I can fix it can you please give me some advise on how to fix it ?.

q how do i fix a low area of a concrete slab
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