Answer:
1. x=6, 2. x=14 3. x= -2, and 4. x=6.5
Step-by-step explanation:
1. 120=20x, x=6.
2. 47=2x+19, x=14
3. 4x+3=2x-1, x= -2
4. 3x+4+7x+11=180, x=6.5
