34 - (2x * 9) =28; 48 - 3x =36; 13 -100x =0; 7x -4 =x -16;

Question

34 - (2x * 9) =28; 48 - 3x =36; 13 -100x =0; 7x -4 =x -16;

Answer 1

1) 34-(2х*9)=28
34-18х=28
-18х=28-34
-18х=-6
х=6/18
х=1/3

2) 48-3х=36
-3х=36-48
-3х=-12
х=-12:(-3)
х=4

3) 13-100х=0
-100х=-13
х=13/100
х=0,13

4) 7х-4=х-16
7х-х=-16+4
6х=-12
х=-12:6
х=-2