Ответ:

0,7x-1,82=0,8x+3,46

0,7x-0,8x=3,46+1,82

-0,1x=5,28

x=5,28:(-0,1)

x=-52,8

2 1/3x+1 1/2=1 2/3x+2 1/3

2 1/3x-1 2/3x=2 1/3-1 1/2

1 4/3x-1 2/3x=2 2/6-1 3/6

2/3x=1 8/6-1 3/6

2/3x=5/6

x=5/6:2/3

x=5/6*3/2

x=5/4=1 1/4

1/2-1 3/5y=4 1/2-3y

-1 3/5y+3y=4 1/2-1/2

-1 3/5y+2 5/5y=4

1 2/5y=4

y=4:1 2/5

y=4*5/7

y=20/7

y=2 6/7

14+5x=4x+3x

5x-4x-3x=-14

-2x=-14

x=-14:(-2)

x=7

3a+5=8a-15

3a-8a=-15-5

-5a=-20

a=-20:(-5)

a=4

3,6+2x=5x+1,2

2x-5x=1,2-3,6

-3x=-2,4

x=-2,4:(-3)

x=0,8