It seems like you're trying to express an integral equation, but the notation is unclear, particularly with respect to the terms involved in the integral. I believe you're asking to solve something of the form:

$y(x) = l - \int (x - t) \cdot j(t) \, dt$

Where:

• $y(x)$ is the solution to the equation,
• $l$ is some constant or function (this needs clarification),
• $j(t)$ is some given function, and
• $t$ is the variable of integration.

Is this interpretation correct? If you can confirm or provide more context (like the limits of integration or any more details about $l$ and $j(t)$), I can proceed with solving it or explaining further.