tolong jawab pake cara no 4,5,6

4.
2x + 4 = 4(x - 3)
2x + 4 = 4x - 12
2x - 4x = -12 - 4
-2x = -16
x = -16/-2
x = 8

5.
-7 - 3x = -2x - 9
-3x + 2x = -9 + 7
-x = -2
x = 2

6.
2(x+5) = 3x - 5
2x + 10 = 3x - 5
2x - 3x = -5 - 10
-x = -15
x = 15