Заменим x на -2:
A=(2 1/3-1/2(-2))-(-5 2/3+3 7/12-1/3(-2))
A=(2 1/3+1)-(5 1/2+3 7/12+2/3)
A=3 1/3-9 5/6
A=-6 2/3
Ответ: A=-6 2/3.
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Заменим x на -2:
A=(2 1/3-1/2(-2))-(-5 2/3+3 7/12-1/3(-2))
A=(2 1/3+1)-(5 1/2+3 7/12+2/3)
A=3 1/3-9 5/6
A=-6 2/3
Ответ: A=-6 2/3.