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2. 12-7=5
3. 70-20=50
4. 8+2=10
5. 200-150=50
6. 2x=16 / x=8
7. 3x=24 / x=8
8. 2n=18 / n=9
9. 2x+4=50 / x=28
10. 3x-9=18 / 3x= 27 / x=9
11. 2x+4=24 / 2x=20 / x=10
12. 4x+4=12 / 4x= 8 / x=2
13. 2x+5=15 / x=5
14. x+8=3x/ x= 4 / 20+4= 24
15.2x-17=100-x / x=39