с двумя премерами первый не надо

2)a) ...x-3=10

x = 3

...x = 13

...= 13/3

...= 4 1/3

б) ...y + 5 = 55, y = 10

...y = 50

...•10 = 50

...= 5

в) 6 + ...x = -6, x = -2

...x = -12

...(-2) = -12

...= 6

3) Розв'яжіть рівняння:

а) 3/4x - 12 = -15

3/4x = -3

x = -3•(4/3)

x = -4

б) 17,5 - 1/2x = -9

17,5 - 0,5x = -9

0,5x = 17,5+9

0,5x = 26,5

x = 53

в) 5 1/3x - 2,4 = 12,6

5 1/3x = 15

16/3x = 15

x = 15•3/16

x = 45/16

x = 2 13/16

г)27 1/3 - 5,4x = 18 1/3

-5,4x = 55/3 - 82/3

-5,4x = -27/3

5,4x = 9

x = 9•10/54

x = 10/6

x = 5/3