google spreadsheet - If column includes a certain value, turn top cell red -

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i want function can check 1 column value , if @ least 1 value found top cell should become red. intent visualize function of top cell in said column: 

if cell in column "a" = "x" cellbgcolor = red else cellbgcolor=white

i don't mind doing in 2 steps, i.e. if value found type "x" in cell , use conditional formatting paint cell.

please try: 

=match("x",a:a,0)

with applies to range: a1.


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