Раскройте скобки и приведите подобные члены.

1) -8*(5-6а)+9(-8а-7)

2)1/3*(1 1/4а-5/6)+1/2*(3 1/3а-8/9)

3) -2,5(5х-1,8)+6,5*(2,2-5х)

ПОМОГИТЕ ПОЖАЛУЙСТА!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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