A nice,unconventional Algebra question.

Level pending

\[\begin{cases}\text{Row A}:\ \ 1,2,3...9\\ \text{Row B}:\ \ 2,3,4...10\\ \text{Row C}:\ \ 3,4,5...11\\ .\\.\\.\\.\\ \text{Row I}:\ \ 9,10,11...17\\ \text{Row J}:\ \ 10,11,12...18\end{cases}\].Find the sum of all the numbers in all the rows.

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