Solve for A, B, C, D, A_15
A=\frac{3A_{15}}{10}+\frac{16D}{5}-\frac{21}{10}
B=\frac{A_{15}}{10}+\frac{3D}{5}-\frac{3}{10}
C=\frac{A_{15}}{10}+\frac{D}{5}-\frac{1}{10}
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