How we know that 5 is to be added ?
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Good question
answer) if I want to know that 5 is added to any particular no if one number is already given. ( this condition only can be applied if another 2nd no gi given) by taking 1st number x
equation is 5 is added to 15 if one no is 10, then simply take on no x and another is 10 (already given)
10+x = 15
x=15-10
x=5 so yes 5 is added
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