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Natural numbers are the counting numbers: 1, 2, 3....
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document.write( "2x-1 <= 4
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document.write( "2x <= 5
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document.write( "x<=5/2 so x is 2 or 1.
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document.write( "2x+2y <= 7(use x=1)
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document.write( "2 + 2y <= 7
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document.write( "2y <= 5
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document.write( "y <= 5/2 so y = 2 or 1.
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document.write( "2x+2y <= 7 (use x=2)
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document.write( "4 + 2y <= 7
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document.write( "2y <= 3
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document.write( "y <= 3/2 so y = 1
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document.write( "Sometimes 0 is considered a natural number. In that case, any of the above could include 0 for y. And if x = 0:
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document.write( "2y <= 7
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document.write( "y <= 7/2 so y could be 3, 2, 1 or 0
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