(3/7-0,25)*x=4,9 , (7/8-0,2)*x=8,1 , (4-2 3/7)*x=2 5/14

Question

(3/7-0,25)*x=4,9 , (7/8-0,2)*x=8,1 , (4-2 3/7)*x=2 5/14

Answer 1

3/7х-1/4х=49/10
12/28х-7/28х=49/10
5/28х=49/10
х=49/10*28/5
х=126/5
х=25 1/5
х=25,2

7/х-1/5х=81/10
35/40х-8/40х=81/10
27/40х=81/10
х=81/10*40/27
х=36/3
х=12

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