Answer:
7
Step-by-step explanation:
Distribute
3x-x+4=18
Combine like terms
2x+4=18
Subtract 4 on both sides
2x=14
Divide 2 on both sides
X=7
x = 7
3x - (x - 4) = 18 =
3x - x + 4 = 18 =
2x + 4 = 18 =
2x + 4 - 4 = 18 - 4
2x = 14
