пж помогите, у меня завтра Соч

[tex] \frac{1}{3} \times (2a - 9) - \frac{1}{2} \times (5b + 4) = [/tex]
при а=
[tex]4 \frac{1}{2} [/tex]
при b=
[tex] \frac{4}{15} [/tex]
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