Помогите решите уравнение раскрывая скобки.

8.4-(х-7.2)=8.6

-1.3+(х-4.8) = -7.1

-5\7 - (m-1) = 11\14

8.4 - (х-7.2) = 8.6,8,4-х+7,2 = 8,6,-х = 8,6-8,4-7,2,х = 7,-1.3+(х-4.8) = -7.1,-1,3+х-4,8 = -7,1,х = -7,1+1,3+4,8,х = -1,-5/7 - (m-1) = 11/14,-5/7-m+1 = 11/14.-m = 11/14+5/7-1.-m = 11/14+10/14-14/14.-m = 7/14.m = -1/2