tentukan nilai X!!! , 1. X + 5 = 2X - 4 2. X - 5 = 2X - 40 3. 2 (X + 3) = X - 2 4. 1/3 X = 27

1. x + 5 = 2x - 4
<=> x - 2x = -5 - 4
<=> -x = -9
<=> x = 9

2. x - 5 = 2x - 40
<=> x - 2x = 5 - 40
<=> -x = -35
<=> x = 35

3. 2(x + 3) = x - 2
<=> 2x + 6 = x - 2
<=> 2x - x = -6 - 2
<=> x = -8

4. 1/3x = 27
<=> x = 27 x 3
<=> x = 81