Math Problem Solver

The solution is: $$y = 3 e \approx 8.1548455$$

$$\begin{aligned}8 e + 3 y + 4 e &= 7 y\\3 y + 12 e &= 7 y\\- 4 y &= - 12 e\\y &= 3 e\end{aligned}$$

$e$ is Euler's number, a mathematical constant that is approximately $2.71828$.