Ответ:

1)-7х=-38

7х=38

х= 38/7

х=5 3/7

2)-5х+45=67

-5х=67-45

-5х=22

х=-22/5

х=-4,4

3)6х+12=4х-45

6х-4х=-45-12

2х=-57

х=-28,5

4)-3(х+6)=4(х-2)

-3х-18=4х-8

-3х-4х=-8+18

-7х=10

х=-1 3/7

5) (4х-5)(2х+9)=0

1)4x-5=0

4х=5

х=5/4

=1.25

2)2х+9=0

2х=-9

х=-9/2

=-4.5