\(\frac{45-x}{1968}+\frac{40-x}{1973}+\frac{35-x}{1978}+\frac{30-x}{1983}=0\)
Vì \(\frac{1}{1968}+\frac{1}{1973}+\frac{1}{1978}+\frac{1}{1983}\ne0\)
\(\Rightarrow2013-x=0\)
\(\Rightarrow x=2013-0\)
\(\Rightarrow x=2013\)
Vậy \(x=2013.\)
Chúc bạn học tốt!