(1)2x-7.5=8.5
2x-7.5+7.5=8.5+7.5
2x÷2=16÷2
x=8;
(2)

2

7

x+

1

2

x=44

11

14

x=44

11

14

x÷

11

14

=44÷

11

14

x=56;
(3)

36

x

=

54

3

54x=36×3
54x÷54=108÷54
x=2.