Question

Решите уравнения).........

Answer 1

13.

-8a+4a=3-9

-4a=-6

a=1.5

14.

7/9c+3=2/3c+5

7/9c-2/3c=5-3

7/9c-6/9c=2

1/9c=2

c=18

15.

0.2f-0.7f=-3.2-2.3

-0.5f=-0.9

f=1.8

16.

-0.4x-0.3x=14

-0.1x=14

x=140

17.

280x-200=-1600

280x=-1600+200

280x=-1400

x=-5

18.

-40t-100=100

-40t=200

t=-5