\int _ { 1 } ^ { 4 } f ( x ) d x + \int _ { 2 b } ^ { 7 } f ( x ) d x = \int _ { 1 } ^ { 7 } f ( x ) d x
Ebatzi: b
\left\{\begin{matrix}b=-2\text{; }b=2\text{, }&f\neq 0\\b\in \mathrm{R}\text{, }&f=0\end{matrix}\right.
Ebatzi: f
\left\{\begin{matrix}\\f=0\text{, }&\text{unconditionally}\\f\in \mathrm{R}\text{, }&b=2\text{ or }x=0\end{matrix}\right.
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