We eliminated y in the given system as follows.

3x + 5y | = | 8 | -3 | -9x - 15y | = | -24 |

5x + 3y | = | 0 | 5 | 25x + 15y | = | 0 |

Adding these equations then gives

- 16x = -24, so that

x = -24/16 = -3/2.

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