1)6,42+2,31b=15,66 2)54,6-(y+14)=18,7 3)6*(3,6x-8,7)=12,6 4) (a-0,95)*0,18=0,549 5) (41,9-y): 4,7=3,5 6) 12x-5x=3,192 7) 7x+5x+0,28=9,1 8)7,7y+15,4+6,5y=65,1

1) 2.31b = 15.66 - 6.42

2.31b = 9.24

b = 4

2)54.6 - y - 14 = 18.7

y = 54.6 - 14 - 18.7

y = 21.9

3)3.6x - 8.7 = 12.6/6

3.6x = 2.1 + 8.7

x = 3

4) a - 0.95 = 0.549/0.18

a = 3.05 + 0.95

a = 4

5) 41.9 - y = 3.5*4.7

y = 41.9 - 16.45

y = 25.45

6) 7x = 3.192

x = 0.456

7) 12x = 9.1 - 0.28

x = 8.82/12

x = 0.735

8) 14.2y = 65.1 - 15.4

14.2y = 49.7

y = 3.5