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fbe0b9e3e5dcbe0c8c464d7c2c30f3f8c90e054d: $$
M
70224bf5dc5aca92e008a4e39be4545ee1395d0b: $$
\color{red} M \dfrac{ \partial ^{2}u }{ \partial t^{2} } \bigg|_{x=L_1+L_2}^{}