Answer:
x = 3
Step-by-step explanation:
4(x+3) - x = x + 18
4x + 12 - x = x + 18
3x + 12 = x + 18
3x - x + 12 = x - x + 18
2x + 12 = 18
2x + 12 - 12 = 18 - 12
2x = 6
2x/2 = 6/2
