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Answer:
(2/5)x + (3/4)x +450 = x
8x+15x/20 +450 = x
23x/20 +450 = x
23x/20 - x = 450
23x-20x/20 = 450
3x/20 = 450
3x = 450 *20
3x = 9000
x = 3000