помогите пожалуйста!!!
упростите выражения:
а) 2х-1/6-3х + 2х+1/2х-4 - х+3/6х-12
б) 2а/а-5 - 5/а+5 + 2а(в квадрате)/25-а(в квадрате)

/ -дробь
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