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2x. -5 when X equals 3?
##1##
To evaluate ##2x-5## at ##x=3##, we replace every instance of ##x## in the given expression with a ##3##.
##2color(red)(x)-5 -> 2color(red)((3))-5##
Then we evaluate the new expression.
##2(3)-5 = 6-5 = 1##