( 5,4 - 4 - 5,4 + 4 ) : 5,4 =
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\frac{1,4-5,4+4}{5,4}
Subtract 4 from 5,4 to get 1,4.
\frac{-4+4}{5,4}
Subtract 5,4 from 1,4 to get -4.
\frac{0}{5,4}
Add -4 and 4 to get 0.
0
Zero divided by any non-zero number gives zero.
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