[tex] \frac{3a - 3b}{2 + 2.5c} = \frac{3(a - b)}{2 + 2.5 \times ( - 2)} = \frac{3 \times 13}{2 - 5} = - \frac{39}{3} = - 13[/tex]
удачи!
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[tex] \frac{3a - 3b}{2 + 2.5c} = \frac{3(a - b)}{2 + 2.5 \times ( - 2)} = \frac{3 \times 13}{2 - 5} = - \frac{39}{3} = - 13[/tex]
удачи!