помогите решить
Упростите выражение:
а) (а - 2) + (а - 3) - (2а + 7)=
б) 2 * (а - 3) - (5а + 6)=
в) -3 * (2х - 9) + (-5х + 1)=
г) (х - 3) + (х - 5) - (7 - 3х)=
д) -2 * (m - 3) - (3m - 5)=
е) 4 * (2а - 1) + (7 - 5а)=
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