Tolong dong, Lg butuh,

1.C semoga membantu....

2.a
5m = 15
m = 15:5
m = 3

3.b
3z + 6 = 27
3z = 27 - 6
3z = 21
z = 21 : 3
z = 7

4.a
x - 9 = -3x + 31
x + 3x = 31 + 9
4x = 40
x = 40 : 4
x = 10

5.c
( x - 1 ) : 2 = 18
x - 1 = 18 x 2
x = 36 + 1
x = 37

6.d
7.d