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Let x be the cost of blouse
     x+600 be the cost of pants

1 200 = x + x+600
1 200 = 2x + 600
1 200 -600 = 2x
600 = 2x
300 = x

The blouse costs 300 and the pair of pants costs 900.
The first x is the cost of the blouse, the x+600 is the cost of the pants it :)
you're a great teacher! ..Thumbs Up
Thanks :)
and by the to write a mathematical statement in the given problem??