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2 July, 04:15

If - a=b and a+c=d then b+c=d

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  1. 2 July, 06:31
    0
    This is incorrect

    -a = b

    a + c = d

    b + c = d is incorrect because it says a + c and not - a + c.

    If you multiply the first line with - 1 then you would get a = - b

    So the final line would actually be - b+c=d
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