Question

(7-0,2x)*1,4=7,56
(6,1x-13,2)/1,7=3

Answer 1

(7-0,2x)*1,4=7,56
9,8-0,28x=7,56
-0,28x=7,56-9,8
-0,28x=-2,24
x=-2,24:-0,28
x=8

Answer 2

(7-0.2х)*1.4=7.56
9.8-0.28х=7.56
-0.28х=7.56-9.8
-0.28х=-2.24
0.28х=2.24
х=8