Упростите выражение: (2а2+4а) + (-а2+а) - (2а2+3а-2)

а) -а2+8а-2       б)3а2+8а-2  в) 3а2+2а+2       г) -а2+2+2

ПОМОГИТЕ СРОЧНО ДАЮ 30 БАЛЛОВ
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