what allow us to put x=a+b+c(adsbygoogle = window.adsbygoogle || []).push({});

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Many times in mathematics in proving something we can put

x=a+b+c or x= a-b^2 or x=y e.t.c.

What axiom or theorem in mathematics allow us to do that??

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# What allow us to put x=a+b+c

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