400+50=450
400+5=405
450+5=455
670-70=600
677-7=670
677-600=77
509-500=9
590-500=500
590-90=500
789-9=780
789-80=709
789-700=89
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400+50=450
400+5=405
450+5=455
670-70=600
677-7=670
677-600=77
509-500=9
590-500=500
590-90=500
789-9=780
789-80=709
789-700=89