Question

1) 19.5-0.3x=15.9; 2)(7-0.2x)*1.4=7.56; 3)(6.1x-13.2):1.7=3;

Answer 1

19.5-0.3х=15.9
0.3х=9.5-15.9
0.3х=3.6
х=3.6:0.3
х=12

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

Answer 2

а 3)

Answer 3

((6,1x-13,2)=3*1,7=5,1 6,1x=5,1+13,2=18,3 X=18,3:6,1=3

Answer 4

спс но там в первом может 19.5