Решите уравнение (1/3+1/2)×х=3,75 (3/5-0,25)×х=4,9 (7/8-0,2)×х=8,1 (4-2 3/7)×х=2 5/14

1)х=3,3
2)х=14
3)х=12
4)х=-1 61/5

(7/8 - 0,2 ) * х = 8,1
1) 7/8 х - 2/10х = 81/10
7/8 х - 2/10х =  35х - 8х/40 = 81/40
27/40х = 81/10
27х * 10 =  40* 81
270х = 3240
 х = 3240/270 = 12

( 4 - 2/3/7 )х = 2 5/14
 4х - 17х/7 = 33/14
28х-17х/7 = 33/14
11х/7 =  33/14   11х *14 7*33
154х = 231 
х= 231/154 = 1,5