If $12\%\text{\hspace{0.17em}of\hspace{0.17em}}980-x\%\text{\hspace{0.17em}of\hspace{0.17em}}450=30\%\text{\hspace{0.17em}of\hspace{0.17em}}227,\text{\hspace{0.17em}then\hspace{0.17em}}x$ is

$12\%\text{\hspace{0.17em}of\hspace{0.17em}}980-x\%\text{\hspace{0.17em}of\hspace{0.17em}}450=30\%\text{\hspace{0.17em}of\hspace{0.17em}}227$

$\frac{12}{100}\times 980-\frac{x}{100}\times 450=\frac{30}{100}\times 227$

$\frac{x}{100}\times 450=117.6-68.1=49.5$

$x=\frac{49.5\times 100}{450}=11$