\(A,x-218=297\)
\(\Leftrightarrow x=297+218=515\)
\(B,469+x=1234\)
\(\Leftrightarrow x=1234-469=765\)
\(C,\left(x-25\right).13=0\)
\(\Leftrightarrow x-25=\frac{0}{13}=0\)
\(\Leftrightarrow x=0+25=25\)
\(D,140-\frac{100}{x}=120\)
\(\Leftrightarrow\frac{100}{x}=140-120=20\)
\(\Leftrightarrow20x=100\)
\(\Leftrightarrow x=\frac{100}{20}=5\)