5(а-2)-6(а+3)-3(2а-9)
5a-10-6(a+3)-3(2a-9)
5a-10-6a-18-6a+27
-7a-10-18+27
-7a-1
Вот)
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5(а-2)-6(а+3)-3(2а-9)
5a-10-6(a+3)-3(2a-9)
5a-10-6a-18-6a+27
-7a-10-18+27
-7a-1
Вот)