ДАЮ 20 БАЛЛОВ!!!

Приведите подобные слагаемые:
а) -4a+12a+13a-27a

б) 42x-48x-63x-24x


в) -17x+19y-15y+13x


г) 9n-8m-7m+35n-19n


ПОМОГИТЕ ПОЖАЛУЙСТА
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