Question

Помогите решите уравнение раскрывая скобки.

8.4-(х-7.2)=8.6

-1.3+(х-4.8) = -7.1

-57 - (m-1) = 1114

Answer 1

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