Step-by-step explanation:
972-a+b-343=628
or,972-a+b=628+343
or,-a+b=971-972
or,-(a-b)=-1
or,a-b=1
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Step-by-step explanation:
972-a+b-343=628
or,972-a+b=628+343
or,-a+b=971-972
or,-(a-b)=-1
or,a-b=1